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Classification

Question 144

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Classification . Answer the questions in reference to the five animal groups listed below.

Premises:
This group contains the most primitive species of the animal kingdom.
This group contains animals with radial symmetry.
Members of this group have a brain with a ventral nerve cord, a complete gut, and they lack a circulatory system that is usually closed.
Members of this group have a brain with a nerve cord, a saclike or branched gut, and they lack a circulatory system.
Members of this group have a pseudocoelomic body cavity.
Responses:
flatworms
roundworms
cnidarians
annelids
sponges

Correct Answer:

This group contains the most primitive species of the animal kingdom.
This group contains animals with radial symmetry.
Members of this group have a brain with a ventral nerve cord, a complete gut, and they lack a circulatory system that is usually closed.
Members of this group have a brain with a nerve cord, a saclike or branched gut, and they lack a circulatory system.
Members of this group have a pseudocoelomic body cavity.
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