1. natural selection acts on existing traits because you can not evolve into something you didn't have
2. original structures evolve to accomplish new function in order to survive
A divide is the elevated boundary between areas that are drained by different rivers system
The correct answer is Psychoneuroimmunology.
Psychoneuroimmunology is known as the the study of the interplays among the psychological processes and the apprehensive and immune structures of the human body. The main goals of the study are the interactions among the nervous and immune structures and the relationships among mental procedures and fitness.
Answer:Lipids perform three primary biological functions within the body: they serve as structural components of cell membranes, function as energy storehouses, and function as important signaling molecules. The three main types of lipids are triacylglycerols (also called triglycerides), phospholipids, and sterols.
triglycerides- fat
phospholipids- plant and animal cell membrane
sterols- plant and animal cell membrane's microorganism.
Explanation:
