Which of the following pairs of values for  x  and  ywould justify the claim that the two triangles are congruent?   x  = 3,  y  = 11x  = 5,  y  = 5x  = 7,  y  = 9x  = 9,  y  = 7

x=3,y=11 (which is A on Edge)

Explanation:

solve for y - 11-4=7

solve for x - 2(3) +3 = 9

Explanation:

X=3,Y=11

The correct answer is A

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: