What is true of macroevolution?

a. it is the same as microevolution, but includes the origin of new species.
b. it is evolution above the species level.
c. it is defined as the evolution of microscopic organisms into organisms that can be seen with the naked eye.
d. it is defined as a change in allele or gene frequency over the course of many generations.
e. it is the conceptual link between irritability and adaptation.

b. It is evolution above the species level.

Explanation:

Macroevolution is the evolution that generates new taxa, for examples two or more species from a common ancestor. Macroevolution is the product of microevolutionary processes, it is, of microevolution: the change in allele frequencies in a population over time.  Macroevolutive changes are commonly evident while not all microevlutive changes are not.

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