Demonstrating the Occurrence of Interspecific Competition During a Field Study

Multiple Choice

Demonstrating the occurrence of interspecific competition during a field study is problematic for all of the following reasons,except

A) it is difficult to know whether a population is at carrying capacity.
B) competition is impossible to measure in a natural setting.
C) scientists cannot control the environment.
D) scientists lack full knowledge of the life history requirements of natural populations.