An Elementary School Science Teacher Decided to Liven Up the Classroom

question 90

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.
-The bivalves started to die one by one; only the undamaged shells remained. To keep the remaining bivalves alive, the teacher would have to remove the

• A) sea anemones.
• B) sea star.
• C) gastropods.
• D) ectoprocts.
• E) parrotfish.

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Definitions:

Bundles

Packages or collections of items or services offered together, often at a reduced price.

Rule of Reason

A legal doctrine used in antitrust law stating that trade practices are only unlawful if they unreasonably restrain trade.

Competition

The activity or condition of competing against others for the same objective or for superiority in a field.

Clayton Act

A piece of U.S. legislation aimed at increasing economic competition and preventing monopolies by prohibiting certain types of anti-competitive practices.