What were the contributing specifications in darwin study of finches

Ans.

Galapagos islands consist several small and large islands, which inhabit several organisms, including Galapagos finches. Darwin studied on the different species of those finches and explained theory of natural selection.  

The primary differences between the Galapagos finches was difference in shape and size of their beaks, which were of great interest to Darwin.

This difference was developed due to natural selection as those finches became adapted to different food sources present in islands.

Thus, the correct answer is 'differences in size and shapes of beaks.'

Read more on -

Explanation:

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