The total energy from an isolated system is constant; energy can be changed from one form to another, but can't be created or destroyed.
No, polar bears does not migrate.
Explanation:
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I am pretty sure that the thing which most likely happen to plants if they did not have a waxy outer coating is being revealed by the last option D. They would be harmed by insects and UV radiation. Every plant has to be protected by membrane so that it would be able to deal with drought small invaders and other external forces.
For the first question the answer is D
For the second question the answer is B
