What leads to long-term immunity in mammals? a. exposure to an antigen b. action of an antibody c. barriers

What is thought to have caused the mass extinction at the end of the cretaceous period?

Ricardo notices that when he plays soccer in the rain, his ball does not seem to go as far after a kick. what is the best scientific question that ricardo could ask about this observation? is soccer better played in the rain or sun? how does rain affect the distance a soccer ball can travel? how does rain affect the speed of a soccer ball? is soccer affected by the rain?

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol