Jill has a beaker. in this beaker there are two layers. the top layer is transparent with a yellow tint to it, and the bottom layer is transparent and clear. jill decides that the bottom layer is probably water. but what is the top layer? the top layer is most likely a a. nucleic acid b. amino acid c. lipid d. carbohydrate

C lipid is the answer

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:

hello

answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this