Answer:
calcium
Explanation:
calcium helps the bone grow effectively
B, The nervous system is the major controlling, regulatory, and communicating system in the body. It is the center of all mental activity including thought, learning, and memory. Together with the endocrine system, the nervous system is responsible for regulating and maintaining homeostasis.
I will as say D because they do it dead things and return it to the earth to be used again
1.b
2. a
3.c
4. d
5. e
6. j
7. h
8. i
9. f
10 g
Answer:
Leukocytes are also called white blood cells. These cells have a nucleus, unlike red blood cells that lack a nucleus. Also unlike red blood cells, white blood cells do not contain hemoglobin, which means they're not involved in the transport of oxygen.