(08.02 mc)researchers determine an organism from africa has a normal distribution for body size. the organism is introduced and released into the united states as an exotic species. after 20 years, scientists have recorded how the organism has fit into the u. s. ecosystem. data show that predators have selected against the exotic species with the larger body size. predict the most likely type of natural selection that occurred on the exotic species over the 20-year period.

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: