Help pls, it's a test about fossils?
Looking at the diagram below, how it is known that the environment changed over time?
A. They are all predators.
B. The organisms gradually become herbivores.
C. At some point, the land was covered in water.
D. The organism gradually become simpler beings.
Answers
Answer:
C. At some point, the land was covered in water.
Explanation:
In the diagram it shows the different fossil layers. In the bottom layers there are shells, but as you go up the fossils start changing. This shows that there used to be water there, but now it is land.
Related Questions
Which is a characteristic of atoms?
They come in ten major
They are the smallest units of matter
They can be divided
They cannot combine together
Answers
Answer:
the second one ..........
Please help ASAP!!
I am not sure how to solve this!
Answers
Answer:
Potassium (K) has 19 protons.
Each neutral atom of Potassium has 19 electrons.
Explanation:
A) Potassium has 19 protons because the atomic number tells us how many protons are in an atom of the element. (The atomic number is the number above the element symbol. For example, the number above "K" is 19, which is the atomic number).
B) If an atom is neutral, this means that the atom has neutral energy. Protons give positive energy and electrons give negative energy. For the atom to be neutral, the atom must have balanced energy, therefore, making the number of electrons equal to the number of protons in a neutral atom.
What would be the correct answers
Answers
Answer:
A chemical bond is formed and energy is absorbed I do believe
Explanation:
If you were to travel from the surface to the center of Earth, the temperature would
increase minimally(not too much).
O stay the same.
increase dramatically(a lot).
decrease dramatically.
Answers
Answer:
increase dramatically(a lot).
Explanation:
The core of the earth is way way way hotter than the surface.
how does the law of conservation of mass applies to all chemical reactions?
Answers
Answer:
the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction. If we account for all reactants and products in a chemical reaction, the total mass will be the same at any point in time in any closed system.
Explanation:
The law of conservation is Matter cannot be created or destroyed in chemical reactions so it means exactly that
Please help asap!
Which of the following is the correct name for B5F2?
A. Boron (II) fluoride
B. Pentaboron difluoride
C. Diboron pentafluoride
D: Barium fluoride
Answers
Answer:
A
Explanation:
I hope this is correct and have a great day
o que significa paleolítico
Answers
Answer:
i believe Paleolithic, also called the Old Stone Age
Explanation:
Identify what type of reaction is this
2AgCl + H2 → 2Ag + 2HCI
Answers
Answer:
single displacement
Explanation:
Which statement best distinguishes comets from nebulae? A. Nebulae can form stars, but comets cannot. B. Comets are in galaxies, but nebulae are not. C. Nebulae have moons. but comets do not. D. Comets can be part of a constellation, but nebulae cannot.
Answers
Answer: A-Nebulae can form stars, comets cannot
Explanation: Simply comets get destroyed and Nebulae are often star-forming regions, such as in the "Pillars of Creation" in the Eagle Nebula. In these regions, the formations of gas, dust, and other materials "clump" together to form denser regions, which attract further matter, and eventually will become dense enough to form stars.
While Nebulae is a body of interstellar cloud, made of cosmic dust, hydrogen etc , Comets are balls of rocks, frozen gases, that revolve the Sun.
Nebulae can form stars, but comets cannot. Option A is correct
What distinguishes comets from nebulae?Nebulae is a different body of interstellar cloud, they are made out of cosmic dust, hydrogen, helium, and molecular clouds.
While Comets are balls of rock, frozen gases, and other particles that revolve around the Sun.
Read more about Galaxy
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I NEED A WORK EQUATION AGAIN HELLPPP PPLS!!!
Answers
Answer:
calcium+ethanoic acid= carbon dioxide + water
Zinc + ethanoic acid= zinc ethanoate+water
Answer:
calcium + ethanoic acid → calcium ethanoate + water
zinc + ethanoic acid → zinc ethanoate + water
As the slope or incline of the land increases, the speed of the water ________________.
Answers
Answer:
increase
Explanation:
ok so this is a answer
The _____ is the identifier of an element.
Answers
Answer:
element of a machine-readable form
Explanation:
Which is Earth's largest source of drinkable water?
O A. lakes
O B. rivers
OC, oceans
O D. aquifers
Answers
Answer:
D.)
Explanation:
How many moles are in 80.00 g of magnesium hydroxide?
1.37moles
0.73moles
46.64moles
Answers
Reason: 80g/58.31g/Mol = 1.37
For each of the following unbalanced equations indicate how many moles of the second reactant would be required to react exalt with 0.275 mole of the first reactant. Balance the equation.Co(s) + P4 (s) Co3P2 (s)
Answers
Answer:
0.183 mol
Explanation:
so balenced equation is 6Co+4P=2(Co3P2)
so so the ratio is 6:4
so .275/6*4
=0.183 mol I think
The Answer will be: 0.183 mol
so that the balanced equation is 6Co+4P=2(Co3P2) When the ratio is 6:4so that .275/6*4
=0.183 mol.
When According to the A balanced chemical is equation has been equal numbers of atoms that are for each element they are involved in the reaction and its represented on the reactant and its product sides.Also that This is a better requirement that makes the equation must be satisfied and also that to be consistent with the law of conservation of the matter. then It may occur that it is confirmed by simply summing the numbers of atoms and also molecules on it either side of the arrow and it's comparing these sums to ensure that they are equal.( 1 CO 2 molecule × 2 O atoms CO 2 molecule) + ( 2 H 2 O molecule × 1 O atom H 2 Molecule ) = 4 O atoms
Learn more about:
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PLEASE HELP!!! How is atomic mass calculated?
A. by adding the mass of the electrons and protons
B. by subtracting the mass of the protons from the mass number
C. by adding the mass of the protons and neutrons
D. by subtracting the mass of the neutrons from the mass number
Answers
Answer:
The answer is C
Explanation:
K12 4.04 Quiz
1. 2 NH3 → N2 + 3 H2
If 2.8248 moles of H2 are produced, how many moles of NH3 were reacted?
2. CaCO3 → CaO + CO2
If 288.53 grams of CaCO3 are reacted, how many moles of CaO will be produced?
3. 2 KClO3 → 2 KCl + 3 O2
If 92.25 grams of KCl are produced, how many grams of O2 will also be produced?
4. 2 As + 6 NaOH → 2 Na3AsO3 + 3 H2
If 3.0482 moles of NaOH are reacted with 212.2 grams of As, how many moles of H2 will be produced?
5. Sn + 2 CuCl → SnCl2 + 2 Cu
If 2.1492 moles of CuCl are reacted with 355.58 grams of Sn, how many moles of SnCl2 will be produced?
Answers
Answer:
BRO IM IN ONLY 7TH GRADE
Explanation:
what is 5x6?
also, to all of the slime rancher players!!
what is your favorite slime? mine is the dervish. dem lil tornado beans :D
Answers
Answer:
30 boiii lol my fav is 110% fire slime or tangle slime. they are BESTTT
Which of the following statements is true a A) dams are made of molecules B) Adams can join to form molecules C) atoms contain more than one element D) some atoms do not have protons
Answers
which statements correctly identify charecteristics of earth and jupiter
Answers
Answer:
There are no statements listed but.... a few ideas
Explanation:
Earth is very small in comparison to Jupiter which is the largest planet of the solar system.
The diameter of Jupiter is 11 times greater than the diameter of the earth.
Earth is a terrestrial planet, whereas Jupiter is a Jovian planet.
Which is an example of heterogeneous mixture?
Answers
Answer:
soil
Explanation:
Conductivity is the
1.ability of a solute to dissolvein a solven
2. ability of substances to allow electrons to flow
3. ability of particles to disperse evenly into another substance
4.inability of particles to disperse evenly into another substance
Answers
Answer:
I'm pretty sure its 2
Explanation:
because that's the only on that makes sense
I Need Help with this plz
Answers
Answer:
a
Explanation:
An initial mixture of nitrogen gas and hydrogen gas is reacted in a rigid container at a certain temperature as follows:
Answers
Answer:
The concentration of nitrogen gas and hydrogen gas that reacted initially are 10.0 M and 11.0 M respectively.
Note: The question is incomplete. The complete question is as follows:
An initial mixture of nitrogen gas and hydrogen gas is reacted in a rigid container at a certain temperature as follows:
3H2(g)+N2(g)⇌2NH3(g)
At equilibrium, the concentrations are
[H2] = 5.0 M, [N2] = 8.0 M, and [NH3] = 4.0 M.
What were the concentrations of nitrogen gas and hydrogen gas that were reacted initially?
Explanation:
Given the following data:
Concentration of H2 at equilibrium = 5.0 M
Concentration of N2 at equilibrium = 8.0 M
Concentration of NH3 at equilibrium = 4.0 M
The given equilibrium reaction is,
Initial a b c
Change -3x -x +2x
Equilibrium (a-3x) (b-x) +2x
The value of x is calculated from the equilibrium of NH3
Concentration of NH3 at equilibrium = 4.0 M = 2x
x = 2.0 M
Substituting the value of x above
Initial Concentration of H2:
a - 3 × 2.0 M = 5.0 M
a = 6.0 M + 5 = 11.0 M
Initial Concentration of N2:
b - 2.0 M = 8 M
b = 8.0 M + 2.0 M
b = 10.0 M
Therefore, the concentration of nitrogen gas and hydrogen gas that reacted initially are 10.0 M and 11.0 M respectively.
What is the purpose of continuing to heat a substance after it reaches a temperature plateau?
Answers
Where does the light we see from the moon come from?
Answers
When sodium bicarbonate and acetic acid are combined in a beaker and allowed to
run to completion, a small amount of sodium bicarbonate remains unreacted at the
bottom of the beaker at the end of the experiment. This means that the sodium
bicarbonate is the
in this experiment.
A) catalyst
B)product
C)excess reactant
D)limiting reactant
Answers
Reason: It is not catalyst because catalyst are not consumed. It is not product because it was one of the reactants. It is not limiting because there was excess left over.
This means that the sodium bicarbonate in this experiment is the Excess reactant.
What is a Reactant?
These are the elements or compounds which are involved in a chemical reaction and react to form the products.
The reactants were sodium bicarbonate and acetic acid with small amounts of the former being unreacted at the bottom of the beaker means it's anm excess reactant.
Read more about Reactants here https://brainly.com/question/6421464
Why has popular media had a negative impact on forensic science?
Answers
Answer:
Because it serves their agenda.
How many moles are in 187 grams of NH3?
11 moles
13.4
moles
3,179 moles
2,618 moles
Answers
Answer:
3126 moles
Explanation:
put them all together times them and add
Help only if you know the answer and I will mark brainliest ⚡️⚡️⚡️
Answers
Answer:
450 kilometers
Explanation:
i used a calculator
Answer:
450 km
Explanation:
I) Construct an equation to find the distance:
speed x time = distance
15 x 30 = d
II) Solve:
15 x 30 = 450
450 km