M, G1, S, and G2. M is mitosis and followed by cytokinesis. S phase is the period when DNA replication occurs.
Answer:
I think The answer is A but I'm not sure
I think it's a community. :)
Calcium is stored in the terminal cisternae in the sarcoplasmic reticulum of the muscle cell. Calcium ions are stored there until muscle contraction occurs. During muscle contraction, calcium ions are released in order to initiate the contraction.
At the start of cellular respiration, energy is stored in the bonds of glucose molecules, but at the end of cellular respiration, energy is stored in the bonds of ATP molecules.
