Answer:
A. Robin A will have an easier time finding a mate.
Explanation:
He will have an easier time since he have more songs, which the females find attractive.
Answer:
I feel it's to easily differentiate the positive from the negative...... like in gram staining of bacteria, the colour tell us which bacteria is gram positive or gram negative...... I just feel that this is science and it is advisable to know what the opposite result of an experiment should look like.
<span>(decreased variation in tail feather color because no form of the trait is advantageous) Due to the fact that the tail color is no longer a necessity, so it will eventually stop being needed and variation will decrease.</span>
Popliteus muscle
from: https://en.m.wikipedia.org/wiki/Popliteus_muscle
Answer: I haven't seen "wolves change rivers", whatever that is, but my best guess would be "carrying capacity"
