A common feature of animal development is the formation of a gut through gastrulation. Three major groups of animals can be classified by gut development: basal animals (lack a complete digestive tract), protostomes (form the mouth pore first), and deuterostomes (form the mouth pore second). Which would best explain why the earliest divergences in animal groups coincides with the earliest stages of embryology? Choice 1 of 2:All life needs to grow through similar life stages to progress; more sophisticated body plans simply continue metamorphosing beyond initial life stages.Choice 2 of 2:Early life is more sensitive to disruption than later stages; selection constrains early development more than later development.
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The three major groups are basal animals, protostomes, and deuterostomes, each with distinct developmental pathways. Show more…
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The higher invertebrates are also classified as determinates or indeterminates. This division is based on which developmental function?Select one of the options below as your answer: A. Whether the blastopore ultimately develops into a mouth or an anus. B. Whether the process of cell differentiation begins early or late. C. Whether the embryonic cells show spiral or radial cleavage. D. Whether the coelom forms by splitting the mesoderm or through the pocket of the gut.
Sri K.
a) What stage of animal embryonic development is specific to animals and distinguishes animals from other types of multicellular organisms? (2 points) b) What developmental stage comes before this stage (your answer to part a) and what stage comes after it? How do these two stages differ from the stage you indicated in part a? (4 points) c) Explain how protostome and deuterostome animals differ in terms of the development of their gut and coelom. (4 points)
Adi S.
Animals with bilateral symmetry are divided into two clades: Protostomes and Deuterostomes. Protostomes means ... Group of answer choices The organism develops the anus first from the blastopore, mouth develops from another region of the embryo. The organism develops the mouth first from the blastopore, anus (if present) develops from another region of the embryo. None of the choices. The organism develops only one opening from the blastopore, which functions as the mouth and anus.
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