Many species of fruit flies feed on fruit produced by fruit trees. A mutation arises in a population of fruit flies that causes its carriers to change their host plant preference from tree species A to a different species of fruit tree (B). These flies complete their whole life cycles on the host tree, from birth to courtship and reproduction to death. If host species A and the host species B occur in the same geographic location, what type of process could potentially lead to speciation between populations of fruit flies with a different host tree preference?

a. Sympatric
b. Peripatric
c. Danicapatricd. Allopatric

Name the following: (a) category of pathogen that causes diseases, like common cold and mumps. (b) the microorganism that requires a host to produce.

The pressurized plants and fungi mentioned in the video have some surprising similarities. what differences would you expect them to have?

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.