EXTINCTION REVIEW

According to most scientists, what is the ultimate cause of most mass extinctions?

• overhunting

• evolution of new species to replace old ones

• major change in environment due to extreme natural events

• asteroid impact

Which of the following species is extinct?

• woolly mammoth
• giant panda
• bald eagle
• green sea turtle

Which of the following is NOT a reason a species may become extinct?

• competition
• reproducing
• habitat loss
• overhunting

Evidence of an animal or plant that lived a long time ago on Earth is called a ________.

• fossil

• tiger

• extinct

• endangered

Humans are causing extiction in which ways?

• By over hunting animals for food or products.
• By destroying the natural habitat of species.
• By polluting the environments of the world.
• All of the above.

What % of the species that have every lived are alive today?

• 1%

• 10%

• 50%

• 75%

The snail darter is a small fish that used to live in the Little Tennessee River. In 1978, a dam was built on the river.  How did the dam most likely affect the snail darter?

• The dam did not affect the darters in the river.
• The dam changed the climate of the area.
• The dam changed the darter's habitat.
• The number of darters increased.

Adelie penguins live in large groups in Antarctica. They lay their eggs in dry, rocky areas. These areas can be flooded when snow melts. According to the text, which of these is the greatest threat to Adelie penguins?

• new predators moving into the area
• competition from other Adelie penguins
• rising temperatures in the penguins' habitat
• people polluting and building in the penguins' habitat

Adelie penguins live in large groups in Antarctica. They lay their eggs in dry, rocky areas. These areas can be flooded when snow melts. According to the text, which of these is the greatest threat to Adelie penguins?

• new predators moving into the area
• competition from other Adelie penguins
• rising temperatures in the penguins' habitat
• people polluting and building in the penguins' habitat

The greatest cause of biodiversity loss today is

• Pollution

• Habitat loss and change

• Climate Change

• Invasive species