The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. however, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. a. forelimb evolution was adaptive in people and bats, but not in whales. b. natural selection in an aquatic environment resulted in significant changes to whale forelimb anatomy. c. genes mutate faster in whales than in humans or bats. d. whales are not properly classified as mammals

Option B

Explanation:

The upper forelimbs of human beings and bats have similar skeletal structures but the same structure has resulted differently in whales.

This is because the natural selection in whales has resulted in change in anatomy and this change in whales has changed their anatomy.

The forelimbs of whales has changed into flippers and it helps whales in swimming.

The forelimbs of human beings, whales and bats have the common ancestors but because of different environment they evolved differently.  

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion

it's c. (to reduce the greenhouse effect/carbon gasses)