Answer:
Photosynthesis adds carbon dioxide to the air
Explanation:
it is D on my point of veiw..
Answer:
When calcium concentration increases during depolarization, it shifts the conformation of troponin and tropomyosin, and actin is able to associate with myosin. As calcium is taken up again by the sarcoplasmic reticulum the muscle cell relaxes.
All of these are essential to survive
