What do you know about a chemical compound by looking at its chemical
formula?
a the properties of the molecules in the compound
b how many molecules are in a sample
chow the compound reacts with other compounds
d the number and kinds of atoms in the compound

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

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?

Agene pool: a) is the collection of all the alleles found in a single species b) is the collection of all the alleles found in a single population c) is the collection of all the chromosomes found in a single population d) is the collection of genes in a species that allow the individuals to swim