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.
I thnk it is age hope it helps
I believe the answer you're looking for is "Specificity".
<em>(Please mark this answer as Brainliest and leave a Thanks if I helped you!)</em>
Hi there,
They are estrogen, progesterone, and testosterone. Estrogen is the main female hormone. Testosterone is the main male hormone. Progesterone is another female hormone related to childbirth, pregnancy, and periods. Insulin has nothing to do with reproduction. It helps your body use sugar. ATP isn't a hormone. It's energy :)
I hope I helped :)
