Magma that forces across rock layers hardens into a

As a small change in a person's dna can cause a genetic disorder

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

Explain how mendel kept his pea plant from self pollination