I believe it is muscle cells, I'm sorry if this is incorrect.
Answer:
A- I have not idea sorry!
B- Looks like a vacuole
C- Cell membrane
D- Endoplasmic Reticulum
Explanation:
Rapid environmental changes can cause:
1) Species can become vulnerable to extinction.
2) A decrease or increase of populations.
3) Diversity of species.
A. they are drugs or hormones used to prevent osteoporosis