Many Crustaceans (E

question 2

Multiple Choice

Many crustaceans (e.g. ,lobsters,shrimp,and crayfish) use their tails to swim,but crabs have reduced tails that curl under their shells and are not used in swimming.This is an example of _____.

• A)an adaptation
• B)a homologous structure
• C)natural selection
• D)a vestigial trait

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Definitions:

Physical and Mental Ability

Refers to the combination of bodily functions and cognitive skills that enable an individual to perform tasks and engage in everyday activities.

Nonanatomical Signs

Indicators or symptoms related to health conditions that are not directly linked to the body's structures or anatomy.

Facial Features and Musculature

The distinctive parts of the face, such as the eyes, nose, and mouth, and the underlying muscle structure that supports and moves them.

Genitals

The external and internal organs of reproduction.