isaactatep808nj
16.10.2019 •
Biology
Interestingly, echinoderms (sea stars and sea urchins) have three germ layers yet they display radial symmetry as adults rather than bilateral symmetry. it has been suggested that their immediate ancestors must have been bilaterally symmetrical and evolved radial symmetry. how can this be explained?
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Ответ:
i don't really know what you're asking. But, if you're asking what the main energy source is then it would be the sun.
Explanation: