Use the Following Information to Answer the Question

question 62

Multiple Choice

Use the following information to answer the question.
The phylum Cycliophora was discovered in 1995. They are tiny organisms that live in large numbers on the outsides of the mouthparts and appendages of lobsters. The feeding stage permanently attaches to the lobster via an adhesive disk and collects scraps of food from its host's feeding by capturing the scraps in a current created by a ring of cilia. The body is saclike and has a U-shaped intestine that brings the anus close to the mouth. Cycliophorans are coelomates, do not molt (though their host does) , and their embryos undergo spiral cleavage.
Which of these features is least useful in assigning the phylum Cycliophora to a clade of animals?

• A) having a true coelom as a body cavity
• B) having a body symmetry that permits a U-shaped intestine
• C) having embryos with spiral cleavage
• D) lacking ecdysis (molting)

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Frequent Awakenings

A symptom often associated with sleep disorders, characterized by waking up multiple times during the night.

Central Sleep Apnea

A sleep disorder where breathing repeatedly stops and starts during sleep due to a lack of respiratory effort.

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The natural cycles of change in our body's chemicals or functions, often influenced by environmental factors such as light and dark.

Respiratory System

The system in living organisms that includes certain organs and structures for exchanging gases, applicable to both plants and animals.