Cnidarians and Ctenophores Are Included in the Animals

question 55

Multiple Choice

Cnidarians and ctenophores are included in the animals. Based on our current understanding of the evolution of these groups, neither is classified as protostome or deuterostome. Which of the following is the MOST likely explanation?

• A)These groups do not undergo gastrulation therefore the timing of mouth development cannot be determined.
• B)These groups do not have an anus, therefore the timing of mouth development (first or second)cannot be determined.
• C)These groups only have two tissue layers; currently only triploblastic organisms are classified based on the fate of the blastopore.
• D)These two groups do not have an axis of orientation for their bodies; they are radially symmetric.

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