The illustration above represents what concept?
A.) Natural selection
B.) Homologous structures
C.) Adaptation
D.) Variation
2.) A fossil that is characteristic of a particular span of geological time or a specific environment is called a(n):
A.) Index fossil
B.) Cast fossil
C.) Petrified fossil
D.) Mold fossil
3.) How is artificial selection different from natural selection? Select the best answer from the choices below.
A.) In artificial selection, animals. that are more likely to survive reproduce.
B.) In artificial selection, members of a species must complete to survive
C.) In natural selection, people impact. which traits are passed on
D.) In artificial selection, humans choose which organisms reproduce.
PLEASE HELP!!!
Answers
Answer:
3 Is D
Explanation:
Related Questions
⚠️Will give brainliest⚠️
Which molecule is relatively inert and
contains a triple bond?
(1) N2
(2)O2
(3) Cl2
(4). H2
Answers
Answer:
N2
Explanation:
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Answer:N2
Explanation:
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options:
genotype
phenotype
Answers
Answer:
phenotype then genotype
Explanation:
phenotype is observable traits, genotype is heritable genes that can be passed down
The speed of light in a vacuum is 2.998×10^8 m/s .
What is its speed in miles per minute (mi/min)?
Answers
Answer:299,800,000
Explain: The speed of light is 3.00x108m/s and in mph is 6.708 x 108.
Put the steps below in the order they are performed in the lab experiment by numbering them 1-7. Use a Bunsen burner to heat and dry the hydrate, repeating until the mass no longer decreases. Measure the final masses of the crucible, cover, and anhydrous salt. Compute differences in masses to find the reactants and products. Measure initial masses of the crucible and cover, with and without the hydrate. Use the numbers of moles to compute the mole ratio. Use stoichiometry to convert these masses to moles. Use the mole ratio to write the hydrate’s formula.
Answers
Answer:
1) Measure initial masses of the crucible and cover with and without the hydrate.
2) Use a Bunsen burner to heat and dry the hydrate, repeating until the mass no longer decreases.
3) Measure the final masses of the crucible, cover, and anhydrous salt.
4) Compute differences in masses to find the reactants and products.
5) Use stoichiometry to convert these masses to moles.
6) Use the numbers of moles to compute the mole ratio.
7) Use the mole ratio to write the hydrate’s formula.
Explanation:
A hydrate is any substance that contains water of crystallization. The water of crystallization constitutes part of the mass of the substance. When heated to constant mass, the substance looses its water of crystallization and becomes anhydrous.
The mass of the anhydrous substance is now obtained by weighing again and subtracted from that of the hydrated substance. The masses are converted to moles using stoichiometry and the moles are then used to obtain the formula of the hydrate.
Answer: answers in order from top to bottom
2
3
4
1
6
5
7
Explanation: right on edg
Do you BELIVE this is how you make Slime?
Slime flows like a liquid, but unlike familiar liquids (e.g., oil, water), its ability to flow, or viscosity, is not constant. So it's a fluid, but not a regular liquid. Scientists call a material that changes viscosity a non-Newtonian fluid. The technical explanation is that slime is a fluid that changes its ability to resist deformation according to shear or tensile stress.
What this means is, when you pour slime or let it ooze through your fingers, it has a low viscosity and flows like a thick liquid. When you squeeze a non-Newtonian slime, like oobleck, or pound it with your fist, it feels hard, like a wet solid. This is because applying stress squeezes the particles in the slime together, making it hard for them to slide against each other.
Most types of slime are also examples of polymers. Polymers are molecules made by linking together chains of subunits.
The specifics of how a type of slime works depends on its chemical composition, but the basic explanation is that chemicals are mixed to form polymers. The polymers act as a net, with molecules sliding against each other.
Two solutions are combined to make classic slime. One is diluted school glue, or polyvinyl alcohol in water. The other solution is borax (Na2B4O7.10H2O) in water.
Borax dissolves in water into sodium ions, Na+, and tetraborate ions.
The tetraborate ions react with water to produce the OH- ion and boric acid:
B4O72-(aq) + 7 H2O 4 H3BO3(aq) + 2 OH-(aq)
Boric acid reacts with water to form borate ions:
H3BO3(aq) + 2 H2O B(OH)4-(aq) + H3O+(aq)
Hydrogen bonds form between the borate ion and the OH groups of the polyvinyl alcohol molecules from the glue, linking them together to form a new polymer: slime.
Answers
How many atoms are in 1.5 moles of calcium
Answers
Answer:
9.0×10^23
Explanation:
1.5mols x [tex]\frac{6.022*10^{23}atoms}{1mol}[/tex]=9.0×10^23
true or false. sound waves are reflected off of soft surfaces
Answers
Answer:
false
Explanation:
soft surfaces absorb sound. :)
Answer:
FALSE
FALSE FALSE FALSE FALSE FALSE
Explanation:
Why Are aquifers important to our freshwater supply? 5TH GRADE ANSWER c:
Answers
Explanation:
Aquifers are porous and permeable formations that stores ground water. The ground water system is made up of mostly fresh water.
An aquifer acts as a reserve for ground water in the environment. By passing through different formations, water that recharges them are purified. This makes them fresh and mostly free from salt intrusionAn aquifer is able to store this fresh water and it is is good prospect for sourcing ground water.
Pure water has a boiling point of 100°C and a freezing point of 0°C.
What is the boiling point and freezing point of a sample of aqueous sodium chloride?
A3
А
B
C
D
boiling point/°C
98
98
102
102
freezing point/°C
-2
2
-2
2
Answers
liquid water For example, the limited temperature range of liquid water (0°C–100°C) severely limits its use. Aqueous solutions have both a lower freezing point and a higher boiling point than pure water.
What is temperature ?How hot (or energetic) a substance or radiation is can be quantified by a physical value called temperature.
There are three different types of temperature scales: those like the SI scale that are defined in terms of the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron in a body; those that only rely on strictly macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are defined by actual empirical properties of particulates rather than by theoretical principles.
Temperature is gauged using a thermometer. It is calibrated using a variety of temperature scales that historically defined themselves using various reference points and thermometric materials. The most widely used scale is the Celsius scale, previously called as "centigrade."
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How far will an object move in 12 seconds if it is traveling at a velocity of 8 m/s?
Answers
Answer:
96 m/s.
Explanation:
Distance equals speed x time,
12 x 8, so the distance is 96 m/s.
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_______ is the process of using a specific material to speed up a chemical reaction, leaving the material unchanged at the end of the reaction.
Answers
Answer:
Catalyse
Note that I'M NOT A SCIENCE TEACHER! I MIGHT BE INCORRECT, DOUBLE CHECK YOUR ANSWER!
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Answer:
Catalyse
Explanation:
Catalysis is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst.
Top answer is most likely true
Bill gates net worth
Answers
Answer:
As of 12/11/2020 Bill Gate's networth is 118.7 billion USD
Explanation:
Answer:
Bill Gates has about 124 billion dollars
a 100 m3 room with an so2 concentration of 75 ppb contains about 0.024 g so2 . how many sulfur atoms does it contain?
Answers
The number of atoms of sulphur is 1.8 × 10^20 atoms.
What is Mole?Mole is defined as the ratio of the given mass of substance to the molar mass of the substance.
Mole = given mass/ molar mass
Given,
Molar mass of SO2 = 64 g
Given mass of SO2 = 0.024g
Number of moles = 0.024/65
= 0.0003 mol
Molecules can also be calculated as
Molecules = 0.0003 × Avogadro Number
Molecules = 0.0003 × 6.023 × 10^23
= 0.0018 × 10^23
= 1.8 × 10^20 molecules
Number of atom of sulphur is equal to the molecules of SO2.
Number of atoms of sulphur = 1.8 × 10^20 atoms
Thus, we calculated that the number of atoms of sulphur is 1.8 × 10^20 atoms.
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A cylinder of compressed gas has a volume of 350 ml and a pressure of 931 torr. What volume in Liters would the gas occupy if allowed to escape into a balloon at a pressure of 113 kPa if temperature and # of molecules remain constant?
Answers
Answer:
[tex]0.384\ \text{L}[/tex]
Explanation:
[tex]P_1[/tex] = Initial pressure = 931 torr = [tex]931\times \dfrac{101.325}{760}=124.12\ \text{kPa}[/tex]
[tex]P_2[/tex] = Final pressure = 113 kPa
[tex]V_1[/tex] = Initial volume = 350 mL
[tex]V_2[/tex] = Final volume
From the Boyle's law we have
[tex]P_1V_1=P_2V_2\\\Rightarrow V_2=\dfrac{P_1V_1}{P_2}\\\Rightarrow V_2=\dfrac{124.12\times 350}{113}\\\Rightarrow V_2=384.44\ \text{mL}=0.384\ \text{L}[/tex]
The volume the gas would occupy is [tex]0.384\ \text{L}[/tex].
The molecule H2O can be correctly described as a?
1) compound.
2) compound and a molecule.
3) molecule.
Answers
The proportions of substances in a mixture
O are always equal for each substance in the mixture
O can vary among the substances
O never can be determined accurately
O are always the same for each substance
2 points
Answers
Which of the following systems has potential energy only?
A) A stone falling from a height
B) A ball rolling down an incline plane
C) A bird sitting on a branch of a tree
D) A flying bird
Answers
Answer D
Explanation:
2n2 h4(g) + 2no2(g) ⇌ 3n2(g) + 4h2o (g)
Answers
Answer:(n2)^3 (h20)^4
(n2)^3 (h20)^2
Explanation:
What is embedded in the phospholipid bilayer and forms the channels and pumps to help molecules pass through the cell membrane
Answers
semen
Explanation: truss this the answer
Brainlist
Which change of state is the reverse of condensation?
O A. Freezing
O B. Vaporization
O C. Melting
O D. Deposition
Answers
Answer:
vaporization is the reserve of condensation
Answer:
B. Vaporization
Explanation:
The opposite of becoming a liquid from a gas is a gas becoming a liquid.
Give the names of the ocean zones from the shore to deep ocean
Answers
Answer:
the intertidal zone, neritic zone, and oceanic zone.
Explanation:
Name the compound O2Cl6
Answers
Answer:
dioxide hexachloride
Which of the following most likely requires intermolecular forces?
Answers
Answer: The intermolecular forces increase with increasing polarization of bonds. Boiling point increases with molecular weight, and with surface area. The three major types of intermolecular interactions are dipole–dipole interactions, London dispersion forces (these two are often referred to collectively as van der Waals forces), and hydrogen bonds. Intermolecular forces are much weaker than the intramolecular forces of attraction but are important because they determine the physical properties of molecules like their boiling point, melting point, density, and enthalpies of fusion and vaporization.In order from strongest to weakest, the intermolecular forces given in the answer choices are: ion-dipole, hydrogen bonding, dipole-dipole, and Van der Waals forces. Ionic bonding is stronger than any of the given intermolecular forces, but is itself NOT an intermolecular force.
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Answer:
A
Explanation:
edge 2020
calculate the number of hydrogen atoms in a 90.0g sample of camphor c10h16o. be sure your answer has a unit symbol if necessary, and round it to 3 significant digits.
Answers
The number of hydrogen atoms in a 90.0g sample of camphor C₁₀H₁₆O is 5.68 X 10²⁴.
The mass of 1 mole of a chemical is indicated by its molar mass. It provides you with the amount of grams per mole of a substance, to put it another way.
Given,
Mass of sample of camphor (C₁₀H₁₆O), m = 90.0g
To find: No. of hydrogen atom in given sample.
Molecular mass of camphor is:
M = 152 g/mol
Moles of camphor,
n = m/M
n = 90/152 = 0.59
1 mole of camphor contains 16 moles of Hydrogen
so, 0.59 moles of camphor contains 9.44 moles of hydrogen
1 mole of any substance contain 6.022 X 10²³ no. of atoms/molecule
So, no. of atoms in 9.44 moles of hydrogen is
N = 6.022 X 10²³ X 9.44
N = 56.84 X 10²³
N = 5.68 X 10²⁴
Hence, The number of hydrogen atoms in a 90.0g sample of camphor C₁₀H₁₆O is 5.68 X 10²⁴.
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How many electrons does calcium have in its outermost shell
Answers
Yes, calcium is defined as a metal because of both its physical and chemical traits. They all have an outer shell with two electrons and are very reactive. Those elements in the second column have two electrons ready to make compounds. It shouldn't surprise you that calcium has a valence of 2.
(5 Points) If you put a piece of zinc into a solution of copper (I) sulfate and allow the single replacement reaction to go to completion, how will you know which of the reactants is the limiting reactant? Write the balanced equation, including the states of matter of the reactants and products, to help support your answer.
CuSO4(___) + Zn (__) → Cu(__) + ZnSO4 (___)
Is it balanced? ____yes____ If not, fix it.
Answers
Answer:
Direct Redox Reactions. When a strip of zinc metal is placed into a blue solution of copper(II) sulfate ( Figure below ), a reaction immediately begins as the zinc strip begins to darken. If left in the solution for a longer period of time, the zinc will gradually decay due to oxidation to zinc ions
Explanation:
We need to balance the equation then can we say
[tex]\\ \rm\Rrightarrow CuSO_4+Zn\longrightarrow Cu+ZnSO_4[/tex]
It's already balancedZn does the reaction so zinc is the limiting reagent ,
Until zinc is present the reaction continues
describe the general trend in electronegativity as metals in group 2 on the periodic table are concidered in order of increasing atomic number
Answers
Answer:
Electronegativity decrease in group from top to bottom
Explanation:
Some lipid rafts are characterized by an accumulation of cholesterol. What does this mean for the fluidity of the lipid raft?.
Answers
The lipid rafts are less fluid than the surrounding membrane at normal temperatures.
Cholesterol decreases the fluidity of the membrane at normal temperatures.
Lipid rafts regulate neurotransmission, receptor traffickinging and influence membrane fluidity.
Lipid rafts are sphingolipid and cholesterol membrane microdomains.
Membrane fluidity refers to the viscosity of the lipid bilayer.
Cholesterol in the rafts has a potential to effectively control the ion conductance and excitability of membranes.
Human brain contains approximately 25% of cholesterol and cholesterol base substances.
Cholesterol influences the fluidity of the membrane, at low temperatures it increases fluidity and at the high temperatures it decreases fluidity.
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why would a peretual machine never work?
Answers
Answer:
Because magnets wear out. Magnetic perpetual machines can never work because magnets eventually wear out. This isn't the reason they don't work. Magnets can lose their magnetism in several ways; Heat them to very high temperatures. Hit them repeatedly with a hammer.
Answer:
It'd never work as the first law of physics is that the law of conservation of energy. It states that energy is often preserved. To keep a machine moving, the energy applied ought to stay with the machine with none losses. As a result of this reality alone, it's not possible to make perpetual motion machines.
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Heat depends on A. Atmospheric pressure B. Particle speed only C. Number of particles D. Both speed and amount