The answer would be, if I understand correctly, skeletal and smooth muscle tissue both help the body move, and give the body form. The skeletal structure give the body structure, and the muscles help the body move.
Answer: A.) The nitrogen cycle recycles nitrogen through an ecosystem, making it available to all organisms.
Explanation: Nitrogen is an essential nutrient for plants and a significant component of proteins, which all animals need to grow, reproduce and survive. The nitrogen cycle converts nitrogen into compounds that plants and animals can use.
<span>Australopithecus afarensis</span>
In 1665, Robert Hooke observed D. Cell Walls through a microscope!