Answer:
A and B? im sorry if its wrong i havent learned that in a long while
Answer:
not much but planting too deep will make hard for your seed to germinate..
Answer:
Calcium
Explanation:
Parathyroid hormone (PTH) is a hormone that is secreted by the parathyroid gland. It is the major regulator of the plasma concentration of calcium ions. It regulates calcium ions in the kidney, intestine and bones.
In the kidney, is involved in the re-absorption of calcium in distal ducts and the renal collecting duct, it is also involved in activating the conversion of 25-hydroxy vitamin D into 1,25-dihydroxy vitamin D (calcitriol).
In the intestine, PTH is involved in the absorption of calcium, by increasing vitamin D production.
In the bone, it helps in regulating calcium levels; when serum calcium level is low, PTH stimulates the activity of the osteoclast, to produce more calcium.
Answer:
Cell Junctions help in moving up a level in the hierarchy of organization of living systems. When cell junctions from, the system goes from the cell level to the _tissue_ level.
Answer:
The proferans exist in the cellular level of organization while the coelenterates are in the tissue level.
