All cells require enzymes<span> to survive and </span>function.Enzymes<span> are catalysts, which means that they make chemical reactions go faster, but are not changed by the reaction.</span>
Answer:
When the diaphragm contracts (it's a large flat muscle), it pulls the lungs down this causing expansion which eventually lead to inhalation of air. If it's injured, then that will be affected.
Answer:
They move hardly at all because there are a lot packed together in a small space. They have a lot of energy also.
Explanation:
Animal cells do not have cell walls because they do not need them. Cell walls, which are found in plant cells, maintain cell shape, almost as if each cell has its own exoskeleton.
