2. Why is sonar a more accurate way of mapping the ocean floor than weighted lines?

How is an environment able to support different varieties of organisms?

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

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