An Elementary School Science Teacher Decided to Liven Up the Classroom

question 32

Multiple Choice

An elementary school science teacher decided to liven up the classroom with a saltwater aquarium. Knowing that saltwater aquaria can be quite a hassle, the teacher proceeded stepwise. First, the teacher conditioned the water. Next, the teacher decided to stock the tank with various marine invertebrates, including a polychaete, a siliceous sponge, several bivalves, a shrimp, several sea anemones of different types, a colonial hydra, a few coral species, an ectoproct, a sea star, and several herbivorous gastropod varieties. Lastly, she added some vertebrates-a parrotfish and a clownfish. She arranged for daily feedings of copepods and feeder fish.
-How many of the following organisms possess bilateral symmetry as adults?
1) sponges
2) molluscs
3) echinoderm
4) sea anemones
5) ectoprocts

• A) one of these
• B) two of these
• C) three of these
• D) four of these
• E) five of these

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Definitions:

Heterosexual Male

A male individual who is sexually attracted to female individuals.

Sexual Response Cycle

The sequence of physical and emotional changes that occur as a person becomes sexually aroused and participates in sexually stimulating activities, including phases of excitement, plateau, orgasm, and resolution.

Sexual Disorder

A type of mental disorder that is characterized by significant distress or impairment in sexual function, desire, or performance.

Refractory Period

A period immediately following the firing of a nerve fiber or muscle during which the nerve or muscle is incapable of responding to stimulation.