Blastopore becomes3/23/2023 The figure shows a cross section of a coelomate showing a coelom and a cross section of a pseudocoelomate showing a pseudocoelom. Development in all animals is determined by the unique family of Hox genes (or other similar homeobox genes). In both protostomes and deuterostomes, the blastopore develops into the mouth. Animals are ingestive heterotrophs Select the correct statement(s) about animal body plans.ĭevelopment in all animals is determined by the unique family of Hox genes (or other similar homeobox genes).Īll triploblastic animals possess a coelom. Identify the features that distinguish animals from organisms in other multicellular kingdoms.Īnimals have sensory organs at their anterior end. The oldest generally accepted fossils of large animals range in age from 565 to 550 million years old. No animal fossils are found in strata formed before the Cambrian explosion.Īpproximately half the phyla of living organisms are found in Cambrian sediments. All animals share a common ancestor Select the correct statement about the evolution of animals. Most animal phyla belong to the clade Radiata. The origin of all extant animal phyla can be traced to the Cambrian explosion. ![]() See Concept 32.3 ()Īrthropods Humans Which of the following statements is correct? See Concept 32.4 ()Įumetazoans have three embryonic tissue layers. ![]() Nematode Flatworm During embryological development, the anus forms before the mouth in _. Which of the following animals does NOT have a body cavity? See Concept 32.3 ()
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