A coelom that arises as outpouches from the archenteron is__________?
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Answer: B. Enterocoelom
Explanation
An enterocoelom is a type of coelom that forms through outpocketing of the embryonic gut. The embryonic gut or archenteron buds off internal pouches that expand to form the coelomic cavity. This sophisticated developmental pathway is a defining characteristic of deuterostome animal lineages. Deuterostomes include echinoderms and chordates which share this unique enterocoelous development. During gastrulation mesodermal pouches pinch off directly from the wall of the archenteron. This contrasts with schizocoelous development where solid mesodermal bands split to form cavities.
Embryologists study enterocoely to understand evolutionary relationships among complex animal phyla. Developmental biology milestones like coelom formation dictate the basic body plan of vertebrates. Comparative anatomy relies on these early embryonic patterns to classify animal developmental origins. Pseudocoelom is a false body cavity that is not completely lined by mesodermal epithelium. Schizocoelom forms through the splitting of solid mesodermal tissue bands rather than gut outpocketings. Saying none of these is incorrect because enterocoelom accurately names this gut-derived cavity.
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