Answer:chain-link fence
Explanation:a cell membrane is partial permeable which means that it lets some substances through but not other.
Answer:
C.
Explanation:
This is because cellular respiration produces C02, which photosynthesis uses.
Answer:
Most hormone feed back is a negative feed back mechansm, A feed back mechanism is a form of a signal mechanism loop where product feed back to control its own production.
Explanation:
For example pancreas is an important gland in an endocrine system which relies on negative feed back to regulate blood glucose level in the body to keep it within the required healthy range.
Answer:
I think A, "Primary pollutants from a stationary source"
Explanation:
Got it right on exam :)
Answer:
One, what is consuming what
Two, Transfer of energy
