Because evolution itself is a very slow process. Having said that, the chance of having a continuum of various animals would mean that evolution would have progressed very fast. Because evolution is slow, different species establish themselves for different ecological niches and environments, this enables them to become better through time at a certain environment which then leads to eventual diversification in the number of species.
I believe the correct answer is true. <span>Scientific concepts can be explained through drawing. By doing so, it would be easier for the people to understand these concepts. Hope this answers the question. Have a nice day.</span>
D. Each trophic level contains one-tenth as much biomass
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-Payshence