Scientists are studying a large population of the mosquito Wyeomyla smithil In New Jersey. They record the average date on which the mosquito larvae pupate (that is, slow down their normal physical functions and become dormant pupae for the winter). The diagram below shows the life cycle of the mosquito. Year 1972 Life Cycle of the Mosquito Eggs 2012 Adult The life cycle of the mosquito is controlled by a genetic switch linked to length of day. Some mosquitoes lay their eggs earlier in the fall season to ensure that their offspring pupate before winter. Mosquitoes that lay their eggs later in the season are able to produce more larvae, but if the larvae do not pupate before the first hard freeze, they die. Data on the change in pupation timing in the mosquito population and weather data are shown in the table below. 5 15 Pupa 69% 56% Larva Pupation Timing in a Mosquito Population Percent of Mosquito Percent of Mosquito Larva That Pupate Before October 15 Larva That Pupale After October 15 45% Average First Frost per Decade Oct. 20 Oct. 24 Oct. 27 6 Based on the results shown in the table, which statement best explains the change in the average time of pupation in the mosquito population?
