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.

multiplying and dividing the two decimals and the eqations by the same number of the overalls