Taxonomy (is an unnecessary science) (helps to classify the immense diversity of life) (is only used by some scientists) (is the study of animal behavior) IT CAN BE MORE THAN ONE ANSWER

Explanation:

1. The classification and naming of organisms in an ordered system that is intended to indicate natural relationships, especially evolutionary relationships.

2. The science, laws, or principles of classification.

3. An ordered arrangement of groups or categories

a

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