What is the od of your culture if the spectrophotometer is reading 0.200 on a sample diluted 1: 5?

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

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

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.