Refer to the Figure Below

question 230

Multiple Choice

Refer to the figure below. The figure shows a simple sponge that lives attached to the ocean floor.The sponge consists of an outer layer of epidermal cells, an inner layer of collar cells and amebocytes, and pore cells that allow water to move from the outside to the inside.The water is propelled by the beating of flagella attached to the collar cells on the inside cavity.Collar cells trap food particles that are digested by the amebocytes.A student claims that a simple sponge could be a model organism used to study how multicellular organisms evolved.Which statement best evaluates this student's claim?

• A) The student's statement is correct because the sponge lives attached to the ocean floor and would therefore be a model for multicellular plant evolution.
• B) The student's statement is correct because the sponge demonstrates a simple structure made up of cells that have specialized to serve different functions.
• C) The student's statement is incorrect because the sponge does not have any recognizable organs or organ systems.
• D) The student's statement is incorrect because the sponge has only four different types of cells while other multicellular organisms have many more.
• E) The student's statement cannot be evaluated, because there is not enough information to support or refute the claim.

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Marginal Wage Cost

The additional cost incurred by hiring one more unit of labor, reflecting the change in total wages from employing an additional worker.

Monopsonistic Labor Market

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