<span>It is false that energy in higher trophic levels is greater than energy at lower trophic levels. In the first trophic level you find the producers, in the second the primary consumers in the level following that the secondary consumers and in the last level the tertiary consumers. And only 10% of energy at one level is available to the next level. </span>
They died, because the divo's only food died and because of the cold. they cannot grow thicker fur in a year, they cannot change their diet drastically, they cannot just learn to hibernate and they are not used to digging.
Question 3, the answer is Zygote
Sorry that's the only one I can answer for sure right now.
Enzymes are important for allowing and speeding up reactions in an organism. They do this by orienting chemical compounds and or substances so that they can easily break and form new products easily, the activation energy is lowered upon the use of such enzymes.