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Bumek [7]
3 years ago
10

Which of the following must occur for speciation to happen?

Biology
1 answer:
Vadim26 [7]3 years ago
5 0
Speciation will only occur if there was life in the area before like a bunrt down forest or soemthing similar
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Damage to what structure may result in a heart murmur?
Sever21 [200]

Answer:

Atrioventricular valves.

Explanation:

Heart is the muscular organ of the body and acts as the pumping organ of the body. Human heart is not bigger than the fist and the human heart is divided into four chambers.

Heart murmur may be defined as the swishing sound that are made during the blood flow. This represent the heart problem. The bicuspid valve of heart is atrioventricular valve. The damage in the atrioventricular valve causes the heart murmuring.

Thus, the answer is atrioventricular valves.

6 0
3 years ago
3. Which is not a true statement about the evidence to support
Katyanochek1 [597]

Answer:

The answers that apply;

Researchers found cosmic microwave background radiation, which is a heat imprint left over from the big bang.

A redshift of light emitted by stars and galaxies indicates the universe is expanding

A primordial form of helium gas was found by the Endeavor space shuttle

Big Bang theory is a theory that endeavors to explain the origin of the universe. It stipulates that the universe exploded from a singularity and continues to expand today

Explanation:

Hope it helps:)

4 0
2 years ago
As liquid water freezes, the molecules arrange themselves in a way that takes up more space than liquid water. What would most l
pickupchik [31]
The appropriate answer is A. the density of ice would be greater than the density of liquid water and so ice would not float. Density can be defined as mass per unit volume. Any substance whose mass is great and occupies a relatively small volume is going to be dense.

Water expands by nine to ten percent when it freezes and this expansion increases the space occupied or the volume and so the density of ice is less than water.
3 0
3 years ago
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Suppose a human blood cell containing a 0.9 percent solute concentration were put into a container of 0 percent solute solution
Vladimir [108]

Answer and explanation:

If a human blood cell with a 0.9% solute concentration were to be put into a container of 0% solute solution, the cell would get BIGGER.

<u>The cell contains a </u><u>more concentrated solution</u><u> than the solution in the container</u>. The difference in concentration would produce an <em>osmotic gradient</em> that would cause water from the container to get inside the cell to even the concentrations - this is going to make the cell much bigger because the entering water would bloat the cell.

In this example, the solution in the container is hypotonic in relation to the cell, while the solution inside the cell is hypertonic in relation to the solution in the container. This is why the water will be moving from outside of the cell to the inside of the cell.

6 0
3 years ago
What evidence in Lavoisier's twelve-day experiment showed that oxygen was chemically reacting (combusting) with substances? A) H
Jlenok [28]
<span>B) He noticed four-fifths of the air had been used up. If by air this question is referring to oxygen, the fact that it has been used up means it has reacted, mean a substance has combusted.</span>
4 0
3 years ago
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