Answer:
D
Explanation:
it has to be D because its talking about "how does a volcanic ash affect water systems"
Answer:
Calcitonin stimulates the kidneys to absorb calcium when calcium levels are too low, while parathyroid hormone stimulates the kidneys to excrete calcium when calcium levels are too high.
Explanation:
Answer:
Like all fluids, blood flows from a high pressure area to a region with lower pressure.
Good luck!
Here are some stuff I found sorry if these don’t help