Q. In which of the following Cloaca which is the posterior opening that serves as the only such opening for the intestinal, reproductive and urinary tracts is present?
Answer: Aves, Amphibians and Reptiles
Notes: Cloaca which is the posterior opening that serves as the only such opening for the intestinal, reproductive and urinary tracts is present in Aves, Amphibians and Reptiles. A cloaca is not present in placental mammals.
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