Cancer and Tumors...
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Answer:
As the temperature of the water goes up, the amount and spatial extent of the kelp goes down. These changes could result in dramatic habitat loss leading to reduced ecosystem productivity and the extinction of many invertebrate species.
Explanation:
Hope it helps :3
I believe the answer you are looking for is median.
example:
2 4 6 |8| 10 12 14
median: 8
three on each side of "8"
in my knowledge biotic factors could affect this process of photosynthesis