how are variations in the spain- bound and uk - bound blackcaps related to the environment in which the birds spend their winters? construct an explanation based on evidence to describe the relationship between variation of traits and environment in the blackcap populations?

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point