20. The effect of human disturbance on animal populations is

stabilizing

O density-independent

Odensity-dependent

O unobservable

The effect of human disturbance on animal populations is density-dependent.

Explanation:

The sudden rise in the population of human lead to high stress on nature which lead to natural resource crunch and adverse impact of animals and nature.

Disturbance are the changes into the environment of animals caused by human activities like clearing forests, resource extraction, industrialization etc. They have extreme effects on the wildlife. They decrease the performance of the prey.