<span>Johnson dubbed the domestic program the "Great Society" -- a sweeping set of New Dealish economic and welfare measures aimed at transforming the American way of life.</span>
Answer:
Physical characteristics.
Explanation:
She knew what type of birds they were based on their physical characteristics.
She didn't see their nests, or see them eat, and she didn't test and analyze their genetics, so a is the correct option.
1 is a depressant, but a specific drug is alcohol and 2 is a hallucinogenic such as LSD or ecstasy