Comparing Ecosystems

A disease reduces the number of young salmon in a river. Which population will MOST likely increase as a result?

• trout and eagle

• algae and trout

• sculpin and algae

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NGSS.MS-LS2-1

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Which lists animals that live in an aquatic ecosystem?

• black bear, deer, vole

• ducks, turtles, amphibians

• panthers, monkeys, snakes

Bryson is comparing two different ecosystems and creates the following list of similarities: aquatic, diverse fish life, high salt concentration, plentiful light at the water's surface. Which two ecosystems is Bryson most likely comparing?

• ocean and lake

• estuary and ocean

• grassland and pond

Which is a difference between abiotic and biotic factors?

• Abiotic factors are plants and biotic factors are animals.

• Abiotic factors are all living things and biotic factors are all nonliving things.

• Abiotic factors are all nonliving things and biotic factors are all living things.

Which is most accurate in describing an estuary ecosystem?

• High salt levels keep the water clear of nutrients and proteins.

• Freshwater mixes with saltwater to provide a nutrient-rich environment.

• Cold water mixes with saltwater to create a cooling effect that encourages growth.

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Which type of ecosystem has the greatest variation in temperature from its top to its bottom?

• lake

• pond

• ocean

• estuary

Which ecosystem is most similar to an estuary?

• salt marsh

• ocean

• pond

Which ecosystem has lifeforms most similar to those of the ocean?

• estuary

• lake

• pond

• swamp

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NGSS.MS-LS2-2

Which is NOT a freshwater ecosystem?

• a river
• a lake 
• an estuary
• a stream

A wetland that contains a mixture of fresh water and salt water is called

• an estuary
• a stream
• a river
• a pond

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