Which of the following statements is an explanation?

a. aggressive chimpanzees should be monitored during meal times or fed separately from other chimpanzees.
b. chimpanzees will behave aggressively when they feel threatened by other individuals.
c. a chimpanzee associates food stealing with aggression due to evolutionary pressure.
d. giving better supplies of food to chimpanzees will decrease their aggressive behavior.

The correct answer is option C. A chimpanzee associates food stealing with aggression due to evolutionary pressure.

In an experiment, the explanation is the part, which explains the phenomena and its reason for occurrence. In chimpanzees, the aggression is seen because of competition, which is a type of evolutionary pressure. The food stealing is the phenomena, which is commonly observed among chimpanzees. Hence, the statement,  A chimpanzee associates food stealing with aggression due to evolutionary pressure is an explanation, which describes the cause of stealing food with aggression.

each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.

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