Short-spined sea urchin fossils were found directly above long-spined sea urchin fossils in a layer of rock. What do the differences between the two sets of sea urchin fossils suggest about them?

The longer spines developed as the shorter-spined sea urchins grew older.
The longer-spined sea urchins existed before the shorter-spined sea urchins.
The shorter-spined sea urchins stretched their spines to ward off predators.
The shorter spines did not protect the sea urchins well enough and they died off.

Answers

Answer 1

Answer:

The longer-spined sea urchins existed before the shorter-spined sea urchins

Explanation:

The lower buried is what died off first and the recently buried is the newly evolved version.

Answer 2

Answer: it shall be opion b

Explanation:


Related Questions

The oldest known fossils Group of answer choices all of the choices. are microscopic. are that of prokaryotes. date back 2.5 billion years ago.

Answers

Answer:

Cyanobacteria from Archaean rocks of western Australia, dated 3.5 billion years old. Cyanobacteria are among the easiest microfossils to recognize

Explanation:

What exactly is the question

Which of these organic molecules function as catalysts for chemical
reactions in living organisms?
A. Enzymes
B. Monosaccharides
C. Amino acids
D. Fatty acids

Answers

Answer:

enzymes

Explanation:

Enzymes are a type of protein that speed up chemical reactions. They are known as "biological catalysts." For example, your stomach would not be able to break down food if it did not have special enzymes to speed up the rate of digestion.

The answer is A. enzymes

which of the following populations receives energy from population at each level of the energy pyramid

A) Boreal owl
B) Mushroom
C) Red squirrel
D) Engelmann spruce​

Answers

Mushroom since it’s a decomposer

Answer:

mushroom

Explanation:

its a decomposer  i think i learned this last year

Easy Question. Will mark brainliest.

Considering the impacts and benefits of bioprospecting, which of the following describes the most likely impact?

It could be harmful to the ecosystem.

It may make additional types of medical treatments available.

It is more expensive than creating synthetic compounds.

It provides additional variety of known chemical compounds.

Which of the following strategies are used in biotechnology to solve a problem?

I. Genetic engineering
II. Biomimicry
III. Biochemical engineering

I only
II only
I and II only
I, II, and III

Answers

Genetic engineering and biochemical engineering
I & II i think so ......

Which is the proper order for blood traveling through the systemic circuit? venae cavae Right arrow. arteries Right arrow. venules Right arrow. capillaries Right arrow. arterioles Right arrow. veins Right arrow. aorta venae cavae Right arrow. arteries Right arrow. arterioles Right arrow. capillaries Right arrow. venules Right arrow. veins Right arrow. aorta aorta Right arrow. arterioles Right arrow. arteries Right arrow. capillaries Right arrow. veins Right arrow. venules Right arrow. venae cavae aorta Right arrow. arteries Right arrow. arterioles Right arrow. capillaries Right arrow. venules Right arrow. veins Right arrow. venae cavae

Answers

Answer: its the second option

The right answer is option 2

How would Earth most likely change if the amount of greenhouse gasses continued to increase?
A Glacier size would increase.
B Air pollution would decrease.
C Global temperatures would increase.
D) Ocean levels would decrease.

Answers

Answer:

C. Global temperatures would increase

Explanation:

greenhouse gases affect temperature, so, it would be C.

Have a great day

answer : c
explanation cause i know it’s c

Which of the following is true of red blood cells? A. They live for only 120 days. B. They have multiple Nuclei. C. They live for only about 20 days. D. Once created in bone marrow, they circulate for our lifetime.

Answers

correct answer is (D. Once created in bone marrow, they circulate for our lifetime)

A. They live for only 120 days is correct. They are created in the bone marrow and destroyed in the spleen "red blood cells graveyard"

B. They have multiple Nuclei. Red blood cells don't have a nucleus but some can present structures called Jolly's bodies that are small pieces of the nucleus that they lost in the differentiation process

C. They only live for only about 20 days. No, red blood cells live for about 120 days

D. Once created in bone marrow, they circulate for our lifetime. Again, they have a limited lifetime

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What type of molecule is represented by the model below?
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O Carbohydrate
Steroid
O Fat
Nucleic acid

Answers

Answer:

Carboydrate

Explanation:

I'm confused with what's going on in the words, but I see a lot of C, H, O, and more. So I'm guessing it's talking about carbohydrates. Don't get mad though it's just the words didn't make sense to me.

Hyponatremia is a condition in which the sodium in the blood is too low. Uncontrolled spasms, which are sudden, involuntary contractions of muscles, are among the symptoms of hyponatremia. Why do they occur?
A.
Sodium is needed to generate an action potential.
B.
Sodium makes up most of the myelin sheath.
C.
Sodium is the signaling molecule that transmits impulses across a synapse.
D.
Sodium controls voluntary movement, and potassium controls involuntary movement.
Reset Next

Answers

Answer:

Option A. Sodium is needed to generate an action potential.

Explanation:

Action potentials are generated by the special types of the voltage-gated channels which are embedded in the plasma membrane of the cell.

These channels are shut when the membrane potential is near zero and the voltage-gated channels open only when the membrane potential is more than the threshold voltage.

When the channels are open then they allow the flow of sodium ions which ultimately changes the electrochemical gradient which rises the membrane potential. This rise in membrane potential generates the action potential.

The correct answer would be A

What does a restriction enzyme create that allows a gene to bond to a plasmid?

Answers

Restriction enzymes are DNA-cutting enzymes. ... DNA ligase is a DNA-joining enzyme. If two pieces of DNA have matching ends, ligase can link them to form a single, unbroken molecule of DNA. In DNA cloning, restriction enzymes and DNA ligase are used to insert genes and other pieces of DNA into plasmids.

which of the following segments of the growth curve would starvation proteins be at their highest detectable levels?​

Answers

No drawing ? If you can send it i might can solve it!
Attach a picture and I will help you!

ASAP/WILL GIVE BRAINLIEST Name at least three short-term effects and three long-term effects of the deforestation in Borneo due to palm oil plantations. please write in your own words, otherwise state sources :)

Answers

Answer:

Short Term Effects of Deforestation:

- soil erosion

- flooding

- fewer crops

- destroyed animal habitats

Long Term Effects of Deforestation:

- climate change

- increased greenhouse gases in the atmosphere

- a number of problems for indigenous people

- desertification

Sorry I don't really know that much about Borneo deforestation but I hope this helps! :)

A wet-mount slide of red onion cells is studied using a compound light microscope.

Answers

I think it is called the anemone
Its called the anemone

How are the alleles for sex-linked traits inherited

Answers

i think the answers c


8. All the abiotic and biotic factors that interact with each other is called
a. A habitat
b. An ecosystem
C.A Niche
d. Commensalism​

Answers

Answer:a niche

Explanation:

I’m pretty sure that it’s an ecosystem

Which of the following statements describes ways cellulose and starch are similar to and different from each other?

Answers

Starch and cellulose

In 2010, a new type of life form was found in California's Lake Mono. The microbe found has a variation in the structure of its DNA. DNA usually consists of nitrogen bases, sugars, and phosphates. However, this newly-discovered microbe uses arsenic if phosphorus is not available. This fact might lead to the discovery of

Answers

Answer:

Life in non earth-like environments

Explanation:

how is nitrogen returned to the atmosphere during the nitrogen cycle

Answers

Search Results
Featured snippet from the web
Nitrogen is returned to the atmosphere by the activity of organisms known as decomposers. Some bacteria are decomposers and break down the complex nitrogen compounds in dead organisms and animal wastes. This returns simple nitrogen compounds to the soil where they can be used by plants to produce more nitrates.
From “the nitrogen cycle”
Nitrogen is returned to the atmosphere by the activity of organisms known as decomposers. Some bacteria are decomposers and break down the complex nitrogen compounds in dead organisms and animal wastes.
Good luck:)

Evaluate whether or not fish farming would have a negative impact on human health

Answers

Fish farming can cause fish diseases cause how close all the fish are it could affect local environment by reducing local fish population the chemicals used as antibiotics to treat fish can leach into surrounding soil and waters and this can poison agricultural land Good things- food supply source of income sea food is loaded with proteins so if fish farms are in poor places it could be really helpful with fighting hunger

Answer:

Fish can’t be super close together or they will break out in disease and when you give some sort of antibiotics in there it spreads into the soil.

In order for a dead organisms remains to become fossilized certain conditions must be met. summarize three of these conditions.

Answers

The organism generally must have hard parts such as shell, bone, teeth, or wood tissue; the remains must escape destruction after death; and the remains must be buried rapidly to stop decomposition. This does make the fossil record biased because animals with soft bodies are less likely to form fossils. It also means that particular environments will not help fossils form because the remains must be buried rapidly and escape the detection of scavengers.
4. Describe three different methods of fossilization.
Organisms can be buried and preserved in substances such as frozen soil, volcanic ash, sediment, ice, oil, and amber. This process preserves even the soft parts. Hard parts such as shells, teeth, bones, and wood can also be more easily preserved because they resist weathering. Hard parts can also become altered due to carbonization (leaves only a thin film of carbonaceous material), petrifaction (gets replaced by minerals in water turning it to stone), and replacement (hard parts dissolve and get replaced by calcite, silica, dolomite, and iron compounds)

The vast majority of deceased organisms vanish without a trace, so fossilization is a rare process.

What are the conditions that favor fossilization:

Hardbody parts (bones, teeth, shells) will fossilize; soft body parts will not but may leave traces (e.g. imprints)

Remains preserved (protection against scavenging, erosion, and environmental damage)

There is a lot of pressure to get the remains mineralized (i.e. turn hard body parts into fossilized rocks)

Anoxic (low oxygen) conditions are used to protect against oxygen damage and to prevent saprotroph decomposition.

Thus, we can conclude that hardbody parts remain preserved, and high pressure and anoxic conditions are required during fossilized.

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Carbohydrates are made of which monomers

Answers

Answer: Describe the monosaccharides. Monosaccharides are the monomers of carbohydrates and are often referred to as “the simple sugars”.

Explanation: You can often recognize a carbohydrate by its suffix – ose (e.g. glucose, sucrose, cellulose, etc.)

Carbohydrates are made of elements Carbon , hydrogen and oxygen! Carbohydrates occur as sugars and polymers. The simplest form which is monosaccharides and disaccharides are sugars and polysaccharides are polymers ! Disaccharides are made of two monosaccharides formed my a glycocidic bond ! For example maltose is made of 2 glucose molecules and sucrose is made of glucose and fructose and lactose is made of glucose and galactose! Monosaccharides bind as a long chain structures or branches and forms a polysaccharide! Usually 100 to 1000 monosaccharides are included ! For example cellulose is made of glucose as it’s monomer and inulin which is present in dalia tubers are made of fructose ! We can obtain monosaccharides by hydrolysis of disaccharides and polysaccharides

Hope this will be useful

what is the out group of this cladogram

Answers

Answer:ur answer is protozoa

Explanation:

In cladistics or phylogenetics, an outgroup is a more distantly related group of organisms that serves as a reference group when determining the evolutionary relationships of the ingroup, the set of organisms under study, and is distinct from sociological outgroups.

The out group in this cladogram is protozoa that is distantly related to the other organism s in the given cladogram.

The out group is a creature that is only distantly connected to the other creatures on the cladogram. The out group, which is commonly assumed to represent the ancestral situation from which the organisms in the cladogram later evolved, contributes to the tree's roots.

The organisms in the in-group are connected to one another. The cladogram is founded on the introduction of a distantly related creature known as the out group. The out group is frequently represented by a single branch on the cladogram.

Out group is an evolutionary phrase that refers to a taxon or lineage that is not part of the taxon group being examined.

Thus, the out group in this cladogram is protozoa.

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are mutations good or bad

Answers

Answer: Mutations can be good or bad.  

Explanation:

Both. Mutations can be good because it can help the species evolve to make survival easier. But they can also be bad because they can cause the opposite to happen.

Many farmers and gardeners compost their plant and animal waste. The living material naturally decays in compost bins, forming a dirt-like substance that’s rich in nutrients. The next season, farmers use this substance as a natural fertilizer for their crops. A biology student has grown tomato plants for several years. Until now, he used an artificial fertilizer formulated for tomato plants. This fertilizer caused his plants to grow faster and taller than they grew in unfertilized soil. The student wants to know whether using natural compost will cause his tomato plants to grow faster and taller than his artificial fertilizer. How does the design of your experiment control for outside factors that may affect the results?

Answers

Answer:

yes the fertile soil will grow faster and taller

Explanation:

the fertile soil will grow faster because  it has what the plant needs

The fertilizer will make it grow faster and always taller so yes indeed:)

*PLEASE ANSWER TY* Which gas makes up the majority of air pollutants? a.) sulfuric acid b.) sodium hydroxide c.) carbon monoxide

Answers

Answer:

carbon monoxide

Explanation:

sulfuric acid is litterally acid

sodium hydroxide..... common now

Carbon monoxide (c.) is the gas that makes up the majority of air pollutants.

What is carbon mono oxide?

Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that is produced by the incomplete combustion of carbon-containing fuels, such as gasoline, natural gas, coal, and wood. It is a highly toxic gas and can be harmful to both humans and animals.

When inhaled, carbon monoxide enters the bloodstream and binds to hemoglobin, the molecule responsible for carrying oxygen to body tissues. This binding affinity is much stronger than that of oxygen, resulting in reduced oxygen delivery to organs and tissues. As a result, exposure to high levels of carbon monoxide can lead to symptoms such as headache, dizziness, nausea, confusion, and in severe cases, loss of consciousness and death.

Carbon monoxide is a significant air pollutant, often found in areas with heavy traffic, industrial emissions, and improper ventilation. It is important to have proper ventilation systems and to use carbon monoxide detectors to minimize the risk of exposure to this dangerous gas.

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VERY VERY EASY QUESTION. WILL MARK BRAINLIEST

A marine biologist explains that salmon populations change over time because of differential reproduction. What is "differential reproduction"?

Some organisms in a population lay eggs, while others produce sperm.

Some organisms in a population produce more male offspring than others.

Some organisms in a population produce more offspring than others.

Some organisms in a population reproduce in rivers, while others stay in the ocean.

Answers

Differential reproduction means that some organisms in a population produce more offspring than others.

Differential reproduction refers to the difference between individuals in a population and how many offspring they are able to leave.The best adapted organisms to a given environment will leave more offspring than those who are not well adapted. Differential reproduction depends on the natural

Answer:

D

Explanation:

Live Fund are selling their holdings at $5,000 per
share. How much would Live Fund receive if they sold
half their holdings in Marks Brothers?
$2.48 million
$4.68 million
$6.8 million
O $42.6 million
$46.8 million

Answers

Answer:

$46,8 million like it. please

$46.8 million your welcome I need to make it 20 letters long.

7. Ecological relationship in which two or more organisms depend on the same
limited resource.
a symbiosis
b. predator
c prey
d competition

Answers

Answer: symbiosis

Explanation:  

Intimate association of organisms of different species to mutually benefit in their vital development.

Answer:D

ExplanationFor limited resources , always compitition occurs between species

The esophagus, a tube that carries food to the stomach, is constantly being scraped as food travels through it. Why does the esophagus not deteriorate through a person’s lifetime? Cells can anabolize the food prior to entering the esophagus. Cells are constantly dividing and replacing old or damaged cells. Cells promote a fluid to build up along the esophagus to reduce friction. Cells build a type of protein called enzymes that act as an armor.

Answers

Cells are constantly dividing and replacing old or damaged cells.

The esophagus does not deteriorate throughout a persons life due to cellular reproduction. When the cells are scraped off by the food, mitosis, or cellular division occurs resulting in two daughter cells from one which will eventually replace the missing cells.

. An experiment studies the effects of an experimental drug on the number of offspring a mother mouse has. 10 female mice are given the drug and then impregnated. The number of mice in their litters is compared to the litters of mice that did not take the drug. Based on the data, what would you conclude about the drug, explain if it worked or not and give your reasoning.?

Answers

Answer:

I don't know the data but you can infer the drug/nondrugged mice had a bigger/smaller litter based on the numbers from the data

Explanation: you would have to include the data so we can give you the answer.

If it worked it be no mice
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