As far as I know, radioactive dating is the measure of radioactive substances in a fossil or something. Like the fossils have a radioactive substance in them, it is the only thing that can show how long the fossils been aging, therefore being able to show the date. And thats how radioactive dating works, and that is how a paleontologist uses it
I'm not sure what you mean by "compartments", but the cardiovascular system consists of the heart, blood vessels, and approximately 5 liters of blood.
So a change in an organism's DNA can cause changes in all aspects of its life.Mutations<span> are essential to </span>evolution<span>; they are the raw material of genetic variation. Without </span>mutation<span>, </span>evolution<span> could not occur.</span>
<span>The </span>spinal<span>nerve </span>exits<span> from the ventral root of the spinal cord.</span>
