When the egg of one species does not react with the sperm of another
species this is
1.gametic isolation
2.temporal isolation
3.behavioral isolation
4.geographic isolation

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only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.

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jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.

dna is a set of a gene held together by a chemical bond