What are the roles of mutation, migration, and selection in bringing about speciation? Drag the terms n the left to the appropriate blanks on the right to complete the sentences. Not all terms will be used. ResetHelp Reproductive isolation reduces genetic differences between populations of a species and can decrease the level of genetic variation in some populations. Mutations that are favorable or detrimental are preserved or removed by natural selection . However, the frequency of the neutral alleles in a population will b

12) several teeth were found in an area of flat land covered with trees and plants. the teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. they found many other shark teeth in this area. however, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. what is the paleontologist's best explanation for why the teeth were found in this area? a) sharks used to live on flat land. b) this area was once covered with salt water. c) this area was once covered with freshwater. d) someone buried the shark teeth deep in the ground.