In nature, selective pressures on populations are varied and interrelated. Select the primary type of selection best describing the situations below based on the information presented. Pathogenic bacteria found in many hospitals are antibiotic resistant. Brightly colored peacocks mate more frequently than do drab peacocks. Fossil evidence indicates that horses have gradually increased in size over geological time. The cheetah is reputed to be the fastest land mammal. The evolutionary process that gave rise to this speed is most likely what kind of selection? A certain species of land snail exists as either a cream color or a solid brown color. Intermediate individuals are relatively rare.

Pathogenic bacteria found in many hospitals are antibiotic resistant.

Explanation:

Antibiotics are drugs that have the ability to kill pathogenic bacteria, especially in hospital environments, where infection cases are more frequent and can be very serious.

However, in a population of pathogenic bacteria, there may be some that, somehow, are resistant to antibiotics. Thus, while the entire population of bacteria dies with the presence of antibiotics, they survive, reproduce and give rise to another population of bacteria that are not affected by the antibiotic. In this case, there was an evolution generated by natural selection, allowing pathogenic bacteria found in many hospitals to be resistant to antibiotics.

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