After the nuclear plant in Japan failed in 2011, nuclear waste was released into the surrounding groundwater and ocean. How did this impact the surrounding human population?

The nuclear waste leaked into groundwater, and exposed humans to radiation that could potentially cause cancer.
The nuclear waste leaked into the ground and stayed in that location, affecting only humans who farmed or otherwise disturbed the soil.
The nuclear waste leaked into the sea and affected those exposed to seawater, but did not affect those on land.
The nuclear waste was not radioactive; therefore it did not affect the human population.

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:

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