Question

Changes in the gene pool can occur due to various mechanisms In 1989 a large oil spill occurred in Prince William Sound, Alaska, when the Exxon Valdez oil tanker ran aground. Approximately 11 million gallons of oil were spilled and spread 1,300 miles along the Alaskan coastline. The damage from the oil spill affected thousands of animals in the area including killer whales harbor seals sea otters fish and sea birds Which mechanism most likely affected the gene pools of the organism populations in the areas around the oil spill?


genetic drift

gene flow

gene mutation

genetic variat

Answer 1

I'll go with Genetic drift

Answer 2

Marsupials are found in North America and Australia, but they would not have been able to swim across the ocean. According to scientists, how did this group of organisms come to live on two separate continents?


Marsupials used to have adaptations that allowed them to swim but lost these adaptations over time.

The two groups of marsupials evolved independently of one another on two separate continents.

The continents were once connected, and marsupials were able to migrate over the land.

The oceans were shallow in prehistoric times, which allowed the marsupials to travel from one continent to another.