Barnacles Live on Exposed Rocks Washed Over by Waves at the Shore.This

question 31

Multiple Choice

Barnacles live on exposed rocks washed over by waves at the shore.This is a description of the barnacles':

• A)community.
• B)habitat.
• C)niche.
• D)ecosystem.

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Definitions:

Nitrate

A polyatomic ion with the chemical formula NO3- or a compound containing this ion, commonly found in fertilizers, explosives, and natural water sources.

Ecosystem Management

A conservation focus that emphasizes restoring and maintaining ecosystem quality rather than the conservation of individual species.

Ecosystem Experiments

Controlled studies designed to investigate the relationships among organisms and their environment within an ecosystem.

Heterocysts

Specialized nitrogen-fixing cells found in some filamentous cyanobacteria, providing an anaerobic environment necessary for the fixation of atmospheric nitrogen.