Simpler organisms tend to have shorter life-spans, thus higher rates of mutation accumulation. And you can see that in action in real life: the greatest diversity exists among the simplest organisms.

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 the simpler the organism, the greater the chances to mutate
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freebookspls

There is no paradox whatsoever, all the contrary, the simpler the organism, the greater the chances to mutate, so under Darwinism, the Cambrian Explosion was bound to happen.