The original habitat of the north american maggot fly, rhagoletis pomonella, was native hawthorn trees. about 200 years ago, some populations colonized newly introduced apple trees. the two populations are still classified as subspecies, but sympatric speciation is under way. what has contributed to incipient speciation in the maggot fly?
a. because apples mature more quickly than hawthorn fruit, the apple-feeding flies have been selected for more rapid developmentb. maggot flies that feed and lay eggs on apples have gradually become adapted to this fruitc. apple maggot flies try to avoid mating with hawthorn maggot flies

Ry was studying two populations of the same species of lizards. one population lived on an island and the other lived on the mainland. both populations were affected by a hurricane that hit the island and the mainland with equal force. a year later, henry was testing the gene frequency and saw a decrease in genetic variation in the island species, but not in the mainland species. which best describes a conclusion he might have reached? gene flow greatly affects small populations, but large populations can recover. genetic drift greatly affects small populations, but large populations can recover. gene flow greatly affects large populations, but small populations can recover. genetic drift greatly affects large populations, but small populations can recover.

One gene can influence trait(s). one trait can be determined by gene(s).

Which of the following would be a body response when stepping outside without a coat on a snowy day? a. senaceous glands. secrete more senum b. more liquid is transported by the body to the skin fir insulation c. blood vessels in the skin narrow and contract d. blood vessels in the skin expand