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On the Origin of Phyla. By James W Valentine. Chicago (Illinois ...

WebThe time of origin of the metazoan phyla is controversial. A common view is that the first coelomates appeared in the late Neoproterozoic, some 700 million years (My) ago, and … WebWhat is the function of the arthropod exoskeleton? It provides protection and functions in locomotion. Propose an explanation for why annelids and arthropods were thought to be closely related, before phylogenetic analyses in the late 1990s. They have segmented bodies, unlike other protostomes. the pga to pgal conversion

Animal Origins Science

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