Which of the following is a characteristic of cnidarians?

A) radula
B) mesoderm
C) gastrovascular cavity
D) bilateral symmetry
E) an anus

The correct answer is option C) "gastrovascular cavity".

Explanation:

Cnidarians are a large group of organisms, most of them found in aquatic environments, known for having specialized cells called cnidocytes which they use to capture their preys. Other characteristic feature of cnidarians is that they have a gastrovascular cavity that serves as the primary organ used for digestion. The gastrovascular cavity is usually surrounded by tentacles that serves to trap their preys. Examples of cnidarians include corals, hydras and jellyfishes.

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explanation:

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"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."