How can biotechnology increase or decrease variation?

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

When rutherford performed his metal foil experiment, he was surprised that most of the alpha particles

Anormal strand of dna is shown below, followed by the same strand of dna after mutations have occurred.