4. Which evidence did Darwin NOT use to support his theory of evolution? a. Observations of fossils
b. Finches on different islands had different types of beaks
c. Young finches that acquired desirable traits as they aged
d. Observations of different species with varying traits

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The answer, I believe, is a.

Explanation:

Observations of fossils came later I believe. :)

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

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times