Sperm-Egg Interactions Are Species-Specific in Sea Urchins,but Not in Mammals

question 18

Multiple Choice

Sperm-egg interactions are species-specific in sea urchins,but not in mammals.What might be one reason for this difference?

• A)Other kinds of signals serve similar functions in mammals.
• B)Sperm-egg recognition relies on egg cytoplasmic components in mammals.
• C)Sperm have evolved to become more selective in mammals.
• D)Sea urchin fertilization occurs in open ocean.

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Definitions:

Total Cost

The aggregate expenditure related to the manufacturing of products or services, which includes both stable and changeable costs.

Variable Inputs

Inputs in production that change in quantity depending on the level of output, such as raw materials and labor.

Marginal Cost

The expense associated with manufacturing an extra unit of a product or service.

Average Fixed Cost

is calculated by dividing the total fixed costs of production by the quantity of output produced, showing the cost per unit of output.