Diverse

http://www.chemguide.co.uk/basicorg/isomerism/geometric.html all you need is restricted rotation about some bond isomerization may occur at diverse conditions, e.g. organic solvent, high energy (light), radicals, enzymes

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Insects and spiders are more diverse because there are more potential niches for them.

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OK, so you have DNA sequences from related species which are somewhere diverse, somewhere are identical. For example the region coding for active site will be probably conserved, while some loops on surface of the protein will be divergent. Both on DNA and ...

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Shouldn't we expect things like insects and spiders to be more diverse since they reproduce rapidly and in such vast numbers?

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... is the development of sexual reproduction, which allows the existence of large long-lived complex organisms by speeding up the production of diverse genetic material beyond that provided by mutation. All of this takes time, and it took less time for oxygen-emitting organisms to terra-form ...

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