Answer:
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I think the answer is B but I could be wronged
The phospholipid no later regulates the amount of water that travels in and out of the cell.
I believe that would be the mantle. Hope this helped!
1.
B
Photosynthetic organisms require light, in which the sun’s rays can only go so far
2.
C
The energy flow pyramid goes from decomposers to producers, meaning that if producers are dying out due to lack of nutrients, there must be something wrong with the decomposer population