Which of these scenarios is an example of natural selection? A. Farmers crossbreed two types of cows to produce a breed of cow that has high quality beef and can tolerate a hot climate.
B. Dogs of the same breed having a desirable coat color are bred with one another to produce more puppies with that same color.
C. Giraffes with longer necks survive the dry season by eating leaves from the tops of trees. Those giraffes breed more successfully that year.
D. People capture yellow fish from the pond and breed only the most attractive individuals. This eventually results in fancy pet goldfish.

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.