PLEASE HELP ME ASAP GIVING 15 POINTS

What is a codon and where is it found

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

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