In 1996, the World Trade Organization (WTO) ruled that the U. S. Environmental Protection Agency (EPA) regulation calling for cleaner gasoline discriminated against foreign producers and violated WTO agreements. The EPA was forced to rewrite the rule to allow for dirtier gasoline. What effect did this revision likely have on world trade? A. The revision probably decreased world trade because gasoline that previously couldn't be sold in the United States was then allowed to be sold there.
B. The revision probably increased world trade because gasoline that previously couldn't be sold in the United States was then allowed to be sold there.
C. The revision probably increased world trade because gasoline that previously couldn't be sold in the United States was made to meet a higher environmental standard.
D. The revision probably decreased world trade because gasoline that previously couldn't be sold in the United States had to be sold in other countries.

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:

option a and d is the correct answer

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explanation:

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"a.) well–developed vascular system."