The scarcity of food affect the size of a finch population

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

Individuals do not compete directly for resources, but are prey for the same predator

Which genetic disorders, caused by an extra x chromosome (xxy), is characterized by a lack of testicular development in males, effeminate features, possible mental impairment, and a thin stature?