Placozoans Are Structurally Simple

question 91

Multiple Choice

Placozoans are structurally simple.They have no mouth, gut, or nervous system and only a few distinct cell types.This simplicity it thought to be secondarily derived, because they

• A) are composed of an upper and lower body surface that sandwiches a layer of contractile fibers.
• B) are sessile filter feeders.
• C) exhibit asexual and sexual reproduction.
• D) have an asymmetrical adult stage.
• E) are found in tropical and subtropical oceans.

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