The survivorship of gobies, and the fecundity of sparrows, both decline at high population densities. This is an example which phenomenon?
a) density dependence
b) survival of the fittest
c) density independence
d) degenerate evolution

a) Density dependance

Explanation:

Density dependant factors are those factors that influence a population differently if the population is crowded than if it is not crowded.

For example :

These factors include :

Hence according to the given scenario, the survivorship of gobies and the fecundity of sparrows, both decline at  high population densities , so this phenomena is density dependance.

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

idk

explanation: