Answer:
not sure but I think it's option C.
Answer: C.) They need the host cell to replicate
Explanation:
Viruses are not made out of cells, they can't keep themselves in a stable state, they don't grow, and they can't make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.
Answer:
The circulatory system, also called the cardiovascular system or the vascular system, is an organ system that permits blood to circulate and transport nutrients, oxygen, carbon dioxide, hormones
B A gene is a portion of a DNA molecule that codes for a protein.
Its not a protein nor RNA
