Which is an abiotic factor that affects a freahwater?

The amount of light that the water receives depends on the time of day and season, depth, how clear the water is, what the weather is like, and the altitude of lakes. Streams and rivers usually have very high light levels due to shallowness and movement of particles, but can vary in places. Wetlands have very low light levels due to usually murky, stagnant water, and unvarying depth hope this helps!

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: