When land inhabited by an organism is destroyed or altered, occurs?

The answer is Extinction. Destruction of a species habitat causes the reduction in the numbers of a population to a point where the reproductive rates are so low to sustain the population. Extinction may indicate the death of the last member of a population. A renowned example of an extinction event is that of dinosaurs whose habitat was destroyed by a meteorite strike.

the correct answer is:

a population changes in response to a change in the environment.