What are the 4 main parts to an amino acid

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

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

In this experiment, the was intentionally manipulated. it is the independent variable. the dependent variables that were measured were the