Many Crustaceans (E

question 21

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)artificial selection.
• B)an extinction.
• C)the law of succession.
• D)a vestigial trait.
• E)natural selection.

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Definitions:

Communication Channel

The medium through which messages are transmitted from a sender to a receiver, such as email, phone, or face-to-face conversation.

Technological Communication

The exchange of information and ideas through the use of electronic devices and software.

Permanent Record

A document or file that records significant information or events, intended to be kept indefinitely without changes.

Email Communication

The use of electronic mail as a means of exchanging messages and information between individuals or groups.