Keystone Species

question 80

Multiple Choice

Keystone species

• A)have little effect on trophic interactions in the community.
• B)are usually one of the larger species in the community.
• C)exert a strong influence on the community because of population size and their ecological niche.
• D)exert a strong influence on the community, not necessarily because of population size, but because of their critical ecological role in the community.
• E)can be removed from some communities without drastic effects on the community.

---

Definitions:

Total Variable Cost

The total of all costs that vary with changes in the production level or sales volume, such as raw materials, direct labor, and variable overhead.

Relevant Range

The range of activity or volume over which the assumed cost behavior is valid, within which fixed and variable costs do not change.

Incremental Manufacturing Cost

The additional cost incurred by producing one more unit of a product, often considered in decision-making and pricing.

Relevant Range

The span of activity or production volume over which fixed and variable costs remain constant on a per-unit basis.