Ecologist Robert MacArthur Observed That Five Species of Similar Warblers

question 29

Multiple Choice

Ecologist Robert MacArthur observed that five species of similar warblers coexisted on spruce trees because they

• A)ate different kinds of insects.
• B)cooperated in their foraging habits.
• C)foraged in different places of the tree canopy.
• D)were actually subspecies of the same species.
• E)were kept below the carrying capacity by predators.

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Definitions:

Variable Overhead Efficiency Variance

The difference between actual variable overhead and the standard cost, reflecting efficiency in using resources that vary with production volume.

July

The seventh month of the year in the Gregorian calendar, often associated with the peak of summer in the Northern Hemisphere.

Variable Overhead Rate Variance

The difference between the actual variable overhead costs and the expected costs based on the standard variable overhead rate.

Planning Budget

A budget created for a particular period or project that estimates revenues, expenses, and other financial details ahead of time.