When scientists study organisms in nature (i. outside of the laboratory), carefully controlled experimentation is not always possible.

When scientists study organisms in nature (i.e. outside of the laboratory), carefully controlled experimentation is not always possible. In a case involving mating behavior of birds, data might be gathered by

A. observations of the birds’ activities during mating season

B. reading about the mating behavior in a book written by biologists for biologists

C. assuming the birds have the same mating behavior as a similar-looking species and substituting some data from the second species

D. using experiments that can be partially controlled and being careful making interpretations

E. two of the above