Which area of the world currently houses most people? (approx 4billion)

North/South America

Africa

Asia + Australia/New Zealand

Europe

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

the answer is c.) there is a warm front in region a and a stationary front in region b.