How are the nervous system of a flatworm and a fish different? my

What organ is the first to receive nutrients that have been absorbed from the digestive tract?

Abiology teacher asks students to give examples of genetic variations that support the idea that changes in a population’s environment affect genetic variation. which is the least supportive example? a. changes in genetics in human populationsb. antibiotic resistance in bacteria populationsc. pesticide resistance in garden insectsd. changes in the color of the peppered moth population in england

Could anybody give me the answer to this question.