The genus Hydra contains small invertebrates related to the jellyfishes.All of the following characteristics of the genus make it unnecessary for these animals to have a cardiovascular system except
A) being aquatic.
B) having no skeleton.
C) consisting of only two cell layers.
D) being small.
E) being primarily sedentary.

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The Answer of The genus Hydra contains small invertebrates related to the jellyfishes.All of the following characteristics of the genus make it unnecessary for these animals to have a cardiovascular system except
A) being aquatic.
B) having no skeleton.
C) consisting of only two cell layers.
D) being small.
E) being primarily sedentary.

The Genus Hydra Contains Small Invertebrates Related to the Jellyfishes