Why is it important to destroy T cells that react with self

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?

How can you tell the difference between rough er from smooth er?

Which of the following is a responsibility of a scientist