Answer:
a
Explanation:
the kidney secretes an enzyme called rennin that helps to control blood pressure is not true the kidney does not secret rennin
There are two atoms that make up a single element
Answer:
a vestigial structure
Explanation:
Vestigial structures are a rudimentary (or even functionless) version of a body part, but they have important functions in a closely correlated or evolutionarily close species, an example of which is the presence of eyes in fish of the genus Astyanax. The existence of these vestigial structures is strong evidence that evolution occurs in organisms, since this structure, today without much apparent function, may in the past have been extremely important to the ancestors of that species.
B, ocean trenches are formed after a underwater volcano has erupted.<span />
