Bacillus thuringiensis, a bacterium commonly known as Bt, produces a protein that can killcertain insects that feed on corn crops. Scientists have been successful in transferring the genethat codes for this protein from the bacterium tothe corn, so the corn can now make the Btprotein. Corn borers, insects that eat corn, diewhen they feed on corn containing the Btprotein. A potential problem associated withincreased production of Bt corn is:

(1) corn borers may stop feeding on corn plants
(2) corn borers may develop resistance to the Btprotein
(3) farmers may need to use less pesticide tocontrol corn borers
(4) corn borers may compete with other insectsthat feed on corn plants

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:

it's c. (to reduce the greenhouse effect/carbon gasses)

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