A) is less inclusive than the population.
B) consists of groups of interacting species.
C) is more inclusive than the ecosystem.
D) requires behavioral interactions among its components.
E) none of the above

A) ecosystem.
B) species.
C) ecosphere.
D) hierarchical level.
E) none of the above

A) requires keen observational skill.
B) is not driven by hypotheses.
C) answers key ecological questions.
D) focuses on ultimate questions.
E) none of the above