Many Polluted Ecosystems Will Recover If We Stop Polluting Them

question 15

Multiple Choice

Many polluted ecosystems will recover if we stop polluting them.This illustrates

• A)loss of ecosystem capital.
• B)the essential role of keystone species in ecosystems.
• C)secondary succession.
• D)the natural resilience of ecosystems.

---

Definitions:

Absolute Threshold

The minimum intensity of a stimulus that one can detect 50% of the time, a concept central to the study of sensory processes.

Taste Constancy

The perception that the flavor of a food item remains consistent despite changes in the environment or context.

Proximal Stimulus

The stimulus registered by the sensory receptors, e.g., the pattern of light falling on the retina, as opposed to the actual object in the environment.

Just Noticeable Difference

The minimal change in a stimulus that can just barely be detected by an organism.