Answer:
2. muscular system and cardiovascular system
Collagen is the structural protein found in skin and connective tissue. This protein is the most abundant protein, that makes up one-third of the protein in the human body. The function of this protein in the skin is to give the skin strength and elasticity, and to replace dead skin cells. In connective tissues it s<span>upports structures and anchor cells to each other.</span>
The large Intestine is the organ that absorbs excess water from undigested food prior to its release from the body as a solid food.
The answer will definitely be B) Compound Light Microscope because other cells can die from the other microscope, and their to powerful, so they can't handle it.
It would be substitution because an incorrect base pair is being replaced.... hopefully thats right?