A Primary School Science Teacher Decided to Liven Up the Classroom

question 8

Multiple Choice

A primary 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 parrot fish and a clown fish. 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 most likely need to remove the ________.

• A) sea anemones
• B) sea star
• C) gastropods
• D) ectoprocts

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Definitions:

Break-Even Point

The level of sales at which total revenues equal total costs, resulting in no profit or loss for the business.

Dollar Sales

A metric that represents the total monetary value of all sales transactions within a specific period, often used in retail and sales analysis.

Target Profit

The desired level of profit that a business plans to achieve within a specific period.

Contribution Format

A format for income statements where all variable expenses are subtracted from sales to calculate contribution margin, which then has fixed expenses subtracted to determine net operating income.