Which process is cause of variation in a species?

Why is a dominant allele called dominant

Two critical interventions to turn around the opioid crises are:

Suppose you use three different scale to weigh a bag of organges. one scale says the nag weighs 2.1 lb, and third says it weighs 2.1 lb. the actual weight of the bag of organges is 2.153 lb. which of the following best decribes these results?