Radial cleavage is the ancestral state for which group of animals? ? Ctenophores. ? Placozoans ? Sponges. ? Cnidarians ? Bilaterians.
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Step 1: Radial cleavage is a type of embryonic development in which the cleavage furrows divide the zygote into equal-sized blastomeres. Show more…
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The Placozoans are asymmetrical, have no nervous systems, have no body cavities, and live in marine environments. 30. The Porifera are planktonic organisms. 31. Choanocytes are characteristic of the Placozoa. 32. Most cnidaria are colonial. 33. The Cnidaria are characterized in part, by nematocysts. 34. The venom of the box jellyfish is a neurotoxin. 35. Most Ctenophores display bioluminescence through the oxidation of luciferin in the presence of a photoprotein.
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Animals with radial zygote cleavage; blastopore becomes anus, and coelom from mesoderm budding from endoderm Sessile, benthic life phase of a cnidarian; a coral or sea anemone Free-living, floating life phase of a cnidarian, a classic jellyfish Extracellular stiffening agent of sponges Flagellated collar cell for feeding in sponges Choanocyte Symbiotic dinoflagellates of corals Stinging cell of cnidarians that Nematocyst also injects venom
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Which of the following groups of early-diverging animals is comprised of two layers of cells that float around in the ocean? a. Cnidaria b. Ctenophores c. Placozoa d. The sponges
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