Use the Information to Answer the Question

question 10

Multiple Choice

Use the information to answer the question.
One small animal phylum (Placozoa) contains only two species, Trichoplax adhaerens (T. adhaerens) and T. reptans. There are four types of cells, none of which are nerve or muscle cells, and none of which have cell walls. T. adhaerens sperm cells have never been observed. Embryos up to, but not past, the 64-cell (blastula) stage have been observed.
On the basis of information in the paragraph, which of these should be able to be observed in T. adhaerens?

• A) a coelom
• B) the process of gastrulation
• C) eggs
• D) a radially symmetric larval form

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Definitions:

Operating Income

The income a business receives after subtracting operating costs from its gross profit.

Fixed Costs

Costs that do not change with the level of production or sales activities, such as rent, salaries, and insurance premiums.

Variable Costs

Costs that change in proportion to the level of production or business activity.

Unit Contribution Margin

The amount each unit sold contributes to fixed costs and profit after variable costs are subtracted.