Field Experiments Differ from Laboratory Experiments in That

Multiple Choice

Field experiments differ from laboratory experiments in that

A) laboratory experiments include controls, but field experiments need not.
B) field experiments can be more easily replicated than laboratory experiments.
C) laboratory experiments allow variables not of direct interest to be controlled, while in field experiments these typically vary.
D) field experiments can teach us about ecological systems, but laboratory experiments cannot.
E) field experiments are often used by ecologists, but laboratory experiments never are.