15. Ctenophores were once thought to be cnidarian. Briefly describe their differences in terms of major...

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Answer 1

Answer #1

The difference between Cnidarian and Ctenophores on the basis of a major organ system and life history are as follows:

Cnidarian	Ctenophores
Cnidaria refers to a phylum containing invertebrates with specialized stinging structures in the tentacles that surround the mouth.	Ctenophora refers to a phylum of coelenterates, which consists of comb jellies.
Exhibit radial symmetry.	Exhibit biradial symmetry.
Highly diversified animals.	Show less diversity.
Live in both freshwater and marine habitats.	Live exclusively in marine habitats.
Show alteration of generations.	Does not show alteration of generations.
Possess both polyp and medusa stages.	Only possess the medusa stage.
Sessile or free-swimming.	Swim by comb plates.
Contain an incomplete digestive system.	Contain a complete digestive system.
Can be either unisexual or hermaphrodites.	Hermaphrodites.
Anthozoa, Hydrozoa, Cubozoa, Scyphozoa, and Staurozoa are the five classes.	Tentaculata and Nuda are the two classes.
Jellyfish, Corals, Hydra, and Sea anemones are some examples.	Comb jellies are examples.

Answer 2

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