Which of the following is not caused by human interactions with the earth system
a: air pollution
b: water pollution
c: mountain building
d: deforestation

C. mountain building

Air pollution, water pollution and deforestation are caused by human interaction with the earth system. Air, water and forests are abiotic (non-living)  factors of the environment on which human population is dependent upon. Release of pollutants in the air and water due to human activities causes pollution. Forests are removed in order to derive resources like wood, medicines and for urban development hence, causes deforestation. Mountain building is a nature induced process and is not caused by human interactions with the earth system. Mountain formation is a geological process, which is caused by large scale movement of the earth's crust. Mountains are formed by folding and faulting of the earth's crust and due to volcanic activity.    

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:

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation: