Question

4) spherica
18 Body forms left and right antimeres in only one
plane in
1) Mollusca
2) Echinodermata
3) Ctenophora 4) Cnidaria
of the three re-​

Answer 1

Answer:

Body forms left and right antimeres in only one plane in Ctenophora.

Explanation:

• Marine predators known as ctenophores, or comb jellies, are delicate, transparent, and primarily pelagic.
• They contain three layers, oral-aboral axis of symmetry, and biradial symmetry (two cell layers and a thick cellular mesoglea).
• There are some actual organs. There are about 80 species that range in size from a few millimeters to over a meter.
• Comb jellies are gelatinous zooplankters that resemble jellyfish but differ significantly from them in a number of key ways.
• There is no colonial organization, no polyp formation, and no dimorphism.
• The lack of cnidocytes results in the usage of cilia rather than muscles for propulsion.
• The apertures at the ends of the gut complete it. The superficial similarities between ctenophores and cnidarians suggest that ctenophores are more closely related to the genus Bilateria than to Cnidaria.

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