Http://teachingamericanhistory.org/lessonplans/act1/
this link should help you
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.
There appearance how they dress look walk talk just observations.
I hope this helped abit
By the people for the people
