I'm pretty sure after water, the most abundant substances in the body are the 6 elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. (:
~PutarPotato
In ecology, allogenic succession is mediated by the abiotic components of the ecosystem, while the autogenic succession refers to the succession, which is mediated by the biotic components of an ecosystem.
A volcanic eruption wiping out an entire island is an example of allogenic succession.
A soybean crop helping in nitrogen fixation, leading to the development of other species is an illustration of autogenic succession.
A tsunami devastating all the living organism in a habitat is an example of allogenic succession.
Oak trees preventing the growth of smaller sun-seeking shrubs is an example of autogenic succession.
Answer:
I would say B, but I'm not completely sure sorry :(
B.
If you were to just dump 10 million liters of crude oil into a lake without knowing what it would do... If the results were bad, then that would harm the environment. (And I guess we all know what will happen if oil is dumped into a lake.)