Imagine That You Wanted to Know If Speciation Is More

question 15

Multiple Choice

Imagine that you wanted to know if speciation is more rapid in plant groups pollinated by bees or hummingbirds. To do this, you identified 20 genera of angiosperms that contained species pollinated by both types of animals. There were substantially more species in the groups that were pollinated by bees. Which of the following conclusions are most consistent with your data?

• A) Hummingbirds promoted speciation more than did bees.
• B) Hummingbirds promoted speciation less than did bees.
• C) Each genus should be split into two new genera.
• D) The rates of speciation were similar in groups pollinated by hummingbirds and bees.

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Definitions:

Aggregate Supply

The total supply of goods and services that firms in an economy are willing and able to sell at a given price level in a specific period.

Government Purchases

Expenditures by the government on goods and services that directly increase the economy's productive capacity.

Autonomous Net Taxes

Taxes that are not influenced by the level of economic activity, such as fixed taxes.

Government Purchases

Government purchases refer to spending by government entities on goods and services that directly contribute to the economy's aggregate demand.