Which Statement Best Describes a Keystone Species

question 6

Multiple Choice

Which statement best describes a keystone species?

• A)a rare or uncommon species that has a strong effect on its community
• B)an abundant species that may or may not affect other species
• C)a species that takes up a great deal of space in a community
• D)a common species that has a strong effect on its community

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Definitions:

M1

A category of the money supply that includes all physical money like coins and currency, as well as demand deposits and other liquid assets held by the central bank.

Double Coincidence of Wants

A condition in barter economies where two parties each hold an item the other wants, making it possible for an exchange to occur without a common medium of exchange.

Barter Situation

A trade system where goods or services are exchanged directly for other goods or services without the use of money as a medium of exchange.

Commodities

Basic goods used in commerce that are interchangeable with other goods of the same type.