Answer:
The answer is D a retrovirus inserts DNA into the host cells genes
Answer:Either the cell wall or the membrane
Explanation:
The cell wall proctects the cell while the membrane forms structures inside of the cell
Rhythmic contraction and relaxation of heart is called <u>The</u><u> </u><u>Cardiac</u><u> </u><u>Cycle</u> .
Start with photosynthesis going in the plants and so on hope this helps?
Answer:
The circulatory system, also known as the cardiovascular system, is a simple loop which starts, and ends, with your heart. It is a closed system, meaning blood does not enter or leave the system during its journey from your heart to your body and back again.
Explanation: