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Alberto Carmona Bayonas (Murcia, Spain)

That is essentially the same questions as why not all the algae in the pond are volvox. Just a matter of an evolutionary trade-off as our stupid politicians actually shows... You can not be the best player in everything. In the tug-of-war between bacteria and protozoa, sheltering, camouflage, changing shape of getting slippery is probably more effective for the former ones...

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