Which types of proteins help defend the body against foreign agents like bacteria? A.
antibodies
B.
hormones
C.
enzymes

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

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer