Who experimented with oil and water layers in 1917

Figure 1. Benjamin Franklin of Philadelphia, L.L.D., F.R.S., in between 1763 and 1785, during the period when he carried out his experiments of oil on water

Explanation:

benjamin franklin

Explanation:

because i aint never seen two pretty best friends, its always one of em gotta be ugly

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:

answer; i believe the correct answer to the above question is ( friction)