3. Study 1 differed from Study 2 in which of the follow-
ing ways?
A. Female fruit Mies were tested in Study I, whereas
male fruit Mies were tested in Study 2.
B. Male fruit flies were tested in Study 1. whereas
ſemale fruit flies were tested in Study 2.
C. The SY medium tested in Study I contained a
lower percent of sugar than did the SY medium
tested in Study 2.
D. The SY medium tested in Study I contained a
higher percent of sugar than did the SY medium
tested in Study 2.