The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that B) tropical regions have more available water and higher levels of solar radiation.
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Microtubules provide a rigid structure, or cytoskeleton
I think it would be the thrid
Homologous chromosomes, is a pair of chromosome connected by a centromere. In sexual reproduction, the chromosome of the mother and the chromosome of the father pairs together.
In terms of human evolution, the sagittal crest was usually more pronounced and larger in older and robust species compared to younger or gracile species.
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