Definition of habitat fragmentation

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?

What function does the limb sever in each animal? how are the limb bones of the four animals similar? based on these similarities what can be inferred about the evolution of the four animals.

Can a trait be both polygenic and have multiple alleles? explain why or why not.