A positive control is a group in an experiment that receives a treatment with a known result, and therefore should show a particular change during the experiment. It is used to control for unknown variables during the experiment and to give the scientist something to compare with the test group.
The answer is that it is True. It is true because the earth has been around for millions of years, and water has been around for just as long. hope this answer helps!
It is on the organ level. The heart consists of cardiac muscle tissue and is part of the cardiovascular organ system. It is basic for the human body to work properly since it provides oxygen for the human body.
The Differences in the Respiratory Systems<span> of </span>Frogs<span> & </span>Humans<span>. </span>Frogs<span> and </span>humans <span>need to breathe for the same reason: to bring oxygen into the body and to expel carbon dioxide. We both have lungs for these tasks, but that's where most of the similarities end.</span>
As in printing a book, if there is a slight defect in the mutation, it will be copied to every other mutation, just like a grammatical error in a book.
