2. Predict what would happen if the population of crabeater seals declined due to the increase of hunting

Which experiment would most likely contain experimental bias ?

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?