How to investigate variation
Inter specific- When species differ from each other
intra specific- When members of the same species differ from each other
Sampling is important the way it is measured must also ensure that it is able to be representative to a population.
-Sampling bias: The researcher may choose where to provide evidence from such as a particular place, so it can be unfair to generalise.
-Chance: Even by trying to avoid the bias sample, the group may be still unrepresentative to us.