Complete to two case studies below using pages 36-37 which describe human modification

The human body is modified with the environmental needs.

Explanation:

A human body is exposed to its environment. There are body enzymes which reacts together to adjust in a certain environment. People living in polluted area are used to of that pollution. They drink polluted water, breathe in polluted air and are still alive but when someone from other area visits such environment, they fall ill and cannot survive in that polluted environment. This is entirely because their body refuses to accept the new changes in environment quickly.

what's the rest of the question

•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: