Answer: C
Explanation: the ecosystem is metastable, so an increase in the keystone species would be accommodated. Introductionof a nonnative species is likely to generate significant biotic change to the environment.
Why does the exploratorium dissect cow eyes?
Answer:At the Exploratorium, we dissect cows' eyes to show people how an eye works. ... A tough, clear covering over the iris and the pupil that helps protect the eye. Light bends as it passes through the cornea. This is the first step in making an image on the retina.
Explanation:
The Exploratorium dissects cow eyes to provide visitors with a hands-on learning experience that helps them understand the anatomy and functioning of eyes.
Cow eye dissection is a popular educational activity at the Exploratorium and similar science museums because it offers a unique opportunity for visitors to engage with real anatomical specimens and gain insights into the complexity of the eye's structure and function. This hands-on experience fosters a deeper understanding of the visual system, how light is focused, and how images are processed by the brain.
The activity allows visitors to compare the similarities and differences between cow eyes and human eyes, leading to discussions about animal adaptations and evolution. Overall, cow eye dissection is an effective and engaging educational tool that promotes scientific inquiry, curiosity, and a better understanding of the remarkable complexities of the visual system.
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Which level of organization is characterized by a group of cells that work together to perform a common function?
organ
tissue
organ system
O organism
Answer:
tissue. . . . . . . . . . . . . .
Stickleback fish are found in both marine and freshwater habitats. The marine fish have no scales but have hardened, armorlike plates along their sides. The plates are thought to protect sticklebacks from certain predators. In the late 1980s, sticklebacks from a marine population colonized Loberg Lake, a freshwater lake in Alaska. Starting in 1990, researchers sampled fish from the lake every four years and recorded the armor-plate phenotypes of the male sticklebacks in each sample. The armor-plate phenotypes were categorized as either complete (plates extending from head to tail), partial (plates extending from head to abdomen), or low (a few plates near the head only). The results are shown in the table below. ARMOR-PLATE VARIATION IN THE STICKLEBACK POPULATION OF LOBERG LAKE Year 1990 1994 1998 2002 2006 Percent of Males in the Sample with Each Armor-Plate Phenotype Low Partial Complete 1% 2% 97% 45% 14% 41% 58% 16% 26% 76% 15% 9% 90% 6% 4%
14. Which of the following is an independent variable in the investigation?
(A) Year in which the sample was collected
(B) Salinity of the water in Loberg Lake
(C) Size of the stickleback population
(D) Percent of males with each armor-plate phenotype
15. To evaluate the reliability of the results, it would be best to know which of the following?
(A) The surface area of Loberg Lake
(B) The number of males in each sample
(C) The average daily temperature of Loberg Lake
(D) The age of the sticklebacks in each sample
Answer:
14. Which of the following is an independent variable in the investigation? (A) Year in which the sample was collected
15. To evaluate the reliability of the results, it would be best to know which of the following? (B) The number of males in each sample
Explanation:
Independent (manipulated) variable: Refers to all the variables in an experiment that provoke a response in another variable. An independent variable is the one that changes or is controlled and modified in the experiment to analyze how another variable responds to it. It changes to analyze its effects on the dependent variable. Usually, the independent variable is represented by the X letter. In the exposed example, the Year in which the sample was collected is an independent variable.Probably the year in which the sample was collected is not the cause of phenotypes differentiation between males, but it is a variable that reflects the change of armor-plate through the years. With this information, scientists can make assumptions and reach a conclusion about the phenotypic variation of the trait in sweet water through the years.
The sample size is very important during a scientific investigation. The correct sample size depends on the investigation project. We need to study a correct amount of individuals to obtain conclusive and reproducible results or, on the contrary, the results will not be informative or robust at all. When sampling wild animals, many times it is difficult to obtain the ideal number of individuals, especially in aquatic animals that are hard to reach, so we have to manage with the amount that we are able to get. However, if we are working with a few individuals, or the samples are not comparable in size with each other, it is very important to consider this in the discussion and conclusions of your work. The risk with small-sized samples is that we might be studying individuals with extreme phenotypes that are not representative of the whole population. This is why it is important to get a certain number of animals, to analyze those that are most representative, and eliminate the outliers.In the exposed example, per sample, we need to get approximately the same amount of male fishes to perform a reliable comparison between years and the phenotypic changes in time.
Answer:
14. A
15. B
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why are plastids called kitchen of the cell
Answer:
Plastids are known as kitchen of a cell because some kinds of plastids (chloroplasts) play a vital role in the process of photosynthesis in which plants make their own food by sunlight,water and nutrients.
Explanation:
I hope this helps!
Answer:Plastids are known as kitchen of a cell because some kinds of plastids (chloroplasts) play a vital role in the process of photosynthesis in which plants make their own food by sunlight,water and nutrients, which makes it more better for animals to eat. And the plant provides healthy nutrients for them.
What two factors cause an increase in the population size?
Answer:
The amount of resources available: food and space
Answer:
health/care access to health care /medical techonlogy ability to fight or prevent disease.
Explanation:
factors that influence human population
I will mark brainliest!! THANK YOU! Students are discussing differentiation of cells in an organism. Which student has to most accurate description of differentiation?
Answer:
Student 2
Explanation:
I think it is student 2 because differentiation is the dividing and changing of embryonic stem cells into cells that are specialized in structure and function. Some stem cells form liver cells, some heart cells, muscle cells.
Answer: Student 1: differentiation occurs during reproduction.
Explanation:
The process of cell differentiation starts with the fertilization of the female egg. As soon as the egg is fertilized, cell multiplication is initiated resulting in the formation of a sphere of cells known as the blastocyst.
Please help with this question ASAP
If the direction of the net force acting on an object is opposite to the direction of movement, the object will speed up.
True
False
offspring growing from a piece of its parent
A)budding
B)fission
C)regeneration
Answer:
Explanation:
B FUFISSION
c) regenergation thats why we are different our parents
producers like this plant take in oxygen and releases carbon dioxide during
Answer:
plants take in oxygen and release carbondioxide during respiration
Explanation:
Can you get water out your blood stream please help I’m scared
Answer:
i wish i could help i don't know
Explanation:
Cancer is often characterized by tumors. Which would most likely trigger the formation of a tumor?
Answer:
When cancer cells begin new tumors far from the primary tumor, metastasis has occurred.
Describe this rock and record your observations. Some things to think about are shape, size, structure and color.
Answer:
It looks like a large rock with a yellowish color, and there are multiple smaller rocks inside the outer core.
Explanation:
Identify the main difference between prokaryotes and eukaryotes.
O Prokaryotes are multicellular while eukaryotes are mostly unicellular
Prokaryotes lack a nucleus and membrane bound organelles while eukaryotes have a
nucleus and membrane bound organelles
Prokaryotes are very complicated, advanced organisms and eukaryotes are very
primitive organisms
Prokaryotes are only found in aquatic environments while eukaryotes can be found
everywhere on Earth
Answer:
Prokaryote slack a nucleus and membrane bound organelles while eukaryotes have a nucleus and membrane bound organelles
Explanation:
None of the other answers make sense and also I took bio this year. Hope this hellped
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Which of the following elements does soil need in the largest quantities to sustain plant life?
Answer:
The appropriate concentration of available nutrients varies depending upon what types of plants are growing in the soil. All plants need high levels of three macronutrients: nitrogen, phosphorus, and potassium.
Answer: The correct answer is Nitrogen
Explanation: This answer has been confirmed correct.
Which type of energy is the flow of electrons from a negative to a positive?
AC is the kind of electrical flow we get from a typical electrical outlet in a home. AC is when the electrons flow in two directions, from the positive to the negative terminal and from the negative to the positive terminal, 'alternating' between the two directions.
When a certain species disappears from the fossil record, what does that indicate?
The species has moved to a different habitat.
A. the species has moves to a different habbitat
B.
None of the above.
C.
The species has gone extinct.
D.
The species has multiplied.
Answer:
c
Explanation:
HURRY QUICK 28. An herbicide killed 99% of a weed population. Which of the following is the BEST
biological explanation for why some weeds were able to survive? (1 point)
O Some individuals were able to evolve before the spraying.
Each individual occupied a different ecological niche and so some were unaffected.
Genetic variation in the population allowed some weeds to survive.
The spray caused some individuals to mutate, and they were able to survive and
reproduce.
Answer:
Genetic variation in the population allowed some weeds to survive
Explanation:
Herbicides are substances that are used to destroy unwanted plants. Herbicides are also called weed killers. An herbicide killed 99% of a weed population.
Some weeds were not able to survive as genetic variation in the population allowed some weeds to survive.
Examples of contact herbicides are as follows:
1. Diclofop
2. Dinoseb
3. Diquat
4. Paraquat
How are functional MRI machines being used to determine the function of different parts of the brain?
Answer:
Magnetic resonance imaging (MRI) is a technology that produces 3D images in order to assess brain activity, which is used in the diagnosis, monitoring and treatment of diseases
Explanation:
Magnetic Resonance Imaging (MRI) is a non-invasive method that generates three-dimensional (3D) images which are used for diagnostics and disease monitoring. MRI is useful to distinguish between white and grey matter in the brain, and thereby this technique can be used for the diagnosis of tumors and aneurysms which are caused by weakness in the arterial walls. Moreover, MRI is also useful to analyze the relationship between regions of the brain and cognitive processes by monitoring the neurological-psychophysiological status of an individual.
The island spotted skunk and the island fox are both predators of the island
deer mouse (the prey). How could these two predators establish different
niches and still prey upon island deer mice? *
A. the island spotted skunk hunts at different times than the island fox
B. the island spotted skunk hunts in the same area as the island fox
C. the island fox eats only cherries instead of deer mice
D. the island deer mice swim to a different island to avoid predators
Answer:
I think the answer is A because if they hunt at the same time they will kill themselves
When moss gets buried and compressed over time, firming what
Answer:
peat
Explanation:
Answer:
The answer you are looking for is peat.
Explanation:
The answer was in the transcript on Edge.
.Which has more thermal energy, 500mL of boiling water or 250mL of boiling water?
Identify the Kingdom:
Eukaryotic
Nucleus
Multicellular
Cell Wall
Chloroplasts
Autotrophic
a) Fungi
b) Protista
c) Animalia
d) Plantae
e) Archaebacteria
f) Eubacteria
Answer:
b portista
Explanation:
I put a picture does anyone know the answer to that
Answer:
C- All members of the population are genetically similar and are less likely to survive environmental change.
Explanation:
In asexual reproduction, there is no diversity since the offspring gets all their genes from their parent. That being said, they won't be able to inherit traits that would help them survive in a changing environment since there is no diversity of traits that would help them in other environments.
Answer:
I think it is C
Explanation:
What’s the answer to this pls
Select all the statements that are consistent with the Endosymbiont Theory Select all the statements that are consistent with the Endosymbiont Theory Mitochondria and chloroplasts are semiautonomous organelles, with many similarities to bacteria. Mitochondria resemble bacteria in size and shape and are surrounded by double membranes, the inner of which has bacterial-type lipids. Chloroplasts have circular DNA molecules. Mitochondria rRNA sequences, ribosome size, sensitivities to inhibitors of RNA and protein synthesis, and type of protein factors used in protein synthesis are all similar to bacteria.
Answer:
Mitochondria and chloroplasts are semiautonomous organelles, with many similarities to bacteria.Mitochondria resemble bacteria in size and shape and are surrounded by double membranes, the inner of which has bacterial-type lipids. Chloroplasts have circular DNA molecules.Explanation:
The endosymbiotic theory essentially states that some organules of the eukaryotic cells, such as mitochondria and chloroplasts, were once free-living bacteria. Probably, these organisms must have been phagocytized, but not digested by another cell. On the contrary, these bacteria were able to adapt to their host in such a way that the two cells established a dependent relationship with each other.
Due to its similarities to other free-living bacteria, it has been speculated that chloroplasts must derivate from cyanobacteria (they both absorb sunlight and store the energy in ATP, and produce organic molecules) and that mitochondria must derivate from rickettsias (they produce ATP in the same manner, by using the Krebs Cycle and Oxidative Phosphorylation).
From the phagocytosis moment, these two cells created a new bond between them of mutual benefit, becoming dependant on each other, up to the point that they would not be able to survive without the other one.
This theory is supported by a few characteristics of the chloroplasts and mitochondria that suggest that they once were a free cell. For example,
Both organelles present their own genetic material. This DNI is independent of the DNA of the cells, is bi-catenary and circular, identical to the DNA of the bacteria, and very different from the one of the eukaryotic cells. These organelles divide by binary fission and not by mitosis, and are capable of synthesizing their own ribosomes and organelles. Both organelles present a double membrane, a characteristic that reinforces the idea of being phagocyted. The internal membrane looks identical to the membrane of bacterias, while the external membrane looks like the eukaryotic one.In fact, in this internal membrane are placed the energy centers, exactly as it occurs in bacterias membrane.
Finally, the sizes of the organelles are similar to the size of some procaryotes.An illustration of a cell interacting with its environment is provided.
The illustration best represents which of the following ?
A.Water moving into a cell by the process of osmosis
B.Passive transport of solute into the cell by diffusion
C.Active transport of solute into the cell using energy
D.Water leaving the cell by the process of osmosis
In the cell, there is passive transport of solute into the cell by the process of diffusion. So the correct option is B.
What is diffusion?Diffusion is a phenomenon that happens when molecules move randomly and results in a net movement of matter from a high concentration area to a low concentration area. The scent of a flower that swiftly fills a room's quiet air is a common illustration.
Thermal energy is transferred or diffused from a higher to a lower temperature through the process of heat conduction in fluids. In order for a nuclear reactor to function, neutrons must diffuse through a material that frequently scatters them but only sometimes absorbs them.
It is discovered that the concentration gradient is proportional to the rate of flow of the dispersing material. If c is the substance's concentration, x is perpendicular to this reference area, and D is the constant of proportionality, then j = D(dc/dx); dc/dx is the rate of growth of concentration in the direction x, and the minus sign denotes that the flow is from higher to lower concentration. The diffusivity, or D, controls the rate of diffusion.
Therefore, the correct option is B.
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Electrical impulses travel down Bundle of His/Purkinje fibres resulting in which stage of the cardiac cycle?
a.Sino atrial(SA) contraction
b.Diastole
c.Ventricular contraction
d.Atrial contraction
Answer:
The correct answer is c.
Explanation:
The cardiac impulse spreads through a bundle of fibers that is a bridge between the atrioventricular node and the ventricular branches, called the bundle of His, supplied by branches of the right coronary artery and the anterior descending artery. The bundle of His is divided into 4 branches: the right and left branches and the latter is divided into the anterior left fascicle and the posterior left fascicle, from where the electrical impulse is distributed to the ventricles through a network of fibers that cause contraction ventricular cells called Purkinje fibers, triggering ventricular contraction. The AV bundle conducts the impulse from the atria to the ventricles. The right and left branches of the Purkinje fibers conduct the cardiac stimulus to all parts of the ventricles. Purkinje fibers or tissue are located in the inner ventricular walls of the heart, below the endocardium. These fibers are specialized myocardial fibers that conduct an electrical stimulus or impulse that intervenes in the heart's nerve impulse causing it to contract in a coordinated manner.
An alkaline earth metal is more reactive than an alkali metal. *
Answer:
an alkaline
Explanation:
when valence electrons are farther from the nucleus, they are attracted less strongly by the nucleus an more easily remove from the atom .this makes the atom more reactive .this make alkaline metal with their two valence electron less reactive than alkali metal with their one valence electron
Well-known persistent organic pollutants (POPs) such as Aldrin, DDT, and PCBs are all __________.
a.
banned in the United States
b.
commonly used herbicides in the United States
c.
restricted in the United States
d.
by-products of acid rain
e.
none of the above
Answer:
A, banned in the United States
Explanation:
I looked up "Is Aldrin banned in the US?", "Are PCBs banned in the US?", etc. They're all banned.