The aortic valve prevents backward flow of blood into the left ventricle.
Answer:
<em>H</em><em>eredity, the sum of all biological processes by which particular characteristics are transmitted from parents to their offspring. ... Each offspring is a combination of its two parents, receiving some dominant traits from its mother and others from its father.</em>
Explanation:
<h3>I hope this helps!</h3>
Answer:
The number of protons in the nucleus of an atom is its atomic number (Z). This is the defining trait of an element: Its value determines the identity of the atom. For example, any atom that contains six protons is the element carbon and has the atomic number 6, regardless of how many neutrons or electrons it may have.