Majority of energy, around 90% in fact, is lost between each trophic level, mostly due to the energy usage of sustaining life, and a lot is lost as thermal energy.
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Answer:
The fact that most eukaryotes reproduce sexually is evidence of its evolutionary success. In many animals, it is actually the only mode of reproduction. The genetic diversity of sexually-produced offspring is thought to give species a better chance of surviving in an unpredictable or changing environment.
