What is the main function of the stem of a plant

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

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?

Plz ! ive been stuck on this forever