Answer:
(b) they are currently overfished :D
Explanation:
http://www.fao.org/fishery/topic/166313/en
The adaptations of organisms in a specific ecosystem are clues of evolution. for example, a giraffe has a long neck to reach leaves of high trees, birds migrate when cold weather comes etc
I believe the answer is <span>phosphorus. Hope this helped!</span>
C) As hydrilla is aquatic in nature, the roots do not have to search for water, and there is no need for xylem to absorb water because the plant is surrounded by water.
Sources of heat from inside earth is radioactive decay and residual heat.