What happened to the sea otter population between the 1700s and 1911?

• It increased rapidly

• It remained stable

• It was nearly wiped out by humans

• It moved to a different ocean

What is a key characteristic of the sea otter's fur?

• It is waterproof

• It is the thickest fur on Earth

• It changes color with the seasons

• It is very thin

What did the governments of the world agree to do by 1911?

• Increase hunting of sea otters

• Stop hunting sea otters

• Move sea otters to a new location

• Breed sea otters in captivity

What is the current status of the sea otter population?

• It has decreased to 1,000

• It has increased to over 100,000

• It has remained at 2,000

• It has moved to a different ocean

What is the main reason for the sea otter's recovery?

• Natural increase in food supply

• Stopping of hunting by humans

• Migration to a safer area

• Increase in predators

What is the effect of a bottleneck on genetic variation?

• It increases genetic variation

• It decreases genetic variation

• It has no effect on genetic variation

• It stabilizes genetic variation

What analogy is used to describe the bottleneck effect?

• A wide river

• A narrow bottle neck

• A large mountain

• A deep ocean

What happens to the traits of organisms that are wiped out in a bottleneck event?

• They are passed on to the next generation

• They are erased from the population

• They become more common

• They change into new traits

What is the main habitat of sea otters?

• Freshwater lakes

• Cold ocean water

• Tropical rainforests

• Desert areas

What is the main reason sea otters were hunted?

• For their meat

• For their thick fur

• For their bones

• For their teeth