Population ecology considers all of the following

a)what species live in a given area

b)the size of an area in which the species live

c)the overall health of the population of the species

d)how human can completely exterminate a species if necessary

The correct answer is option D which is, "how human can completely exterminate a species if necessary".

Population is the individual relating to the same specie living in the same area at the same time. Like the population of the cats living in the local jungle.

Ecology is the study and observation based study of species and their relation with their natural environment.

Hence population ecology is the study of a single population with respect to their community.

So all above 3 options A, B and C are related to population ecology except option D.

i think it's they require warm air

explanation:

tornados usually happen when it's raining right so when it's raining it cools down so if the temperature keeps changing then i think a tornado occurs sorry if it's wrong

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation: