5. X^A X^a
6. AA
Explanation
E<span>ach atomic number identifies a specific element, but not the "Ion/Charged particle"
Hope this helps!</span>
Nerve cells, Blood cells, Reproductive cells, Skin cells
<span>The ventricles are the part of the heart that are responsible for the pumping action to move blood throughout the body. Therefore, the muscles in the ventricles are much larger and thicker to do their job properly. The atrium only has to pump blood through an open valve (the tricuspid valve) into the right ventricle. There is much less resistance to this flow of blood so much less muscle is needed. </span>
Vestigial structures are often homologous to structures that are functioning normally in other species. Therefore, vestigial structures can be considered the evidence for evolution, the process by which beneficial heritable traits arise in populations over an extended period of time.
