NGSS.MS-LS2-4

Which species would be most affected by the overfishing of Alaskan salmon?

• bears
• crayfish
• lobsters
• opossum

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NGSS.MS-LS2-4

Prairie dogs rely on underground tunnels for shelter. Which bestexplains how the prairie dog population is affected when their tunnels are disrupted and exposed?

• The prairie dogs are burned by the sun.
• The prairie dogs are exposed to predators
• The prairie dogs can find more food to eat in the fields
• The prairie dogs are forced to learn to live in trees and shrubs

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NGSS.MS-LS2-4

Examine the diagram of a food web.

A small population of eagles is introduced in the food web. The eagles feed on mice and reproduce at high rates. What is the most likely consequence of the introduction of eagles in the food web?

• A. The eagles will coexist with the hawks.

• B. The hawks will prey on grasshoppers.

• C. The eagles will compete with the hawks.

• D. The hawks will establish a mutualistic relationship with mice.

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NGSS.MS-LS2-4

Which scenario describes an example of extinction?

• Water pollution kills off all the fish that live in a small pond.

• Every individual in a species is killed by hunters or a lack of food.

• The cutting down of a tree forces a bird to build a new nest in another tree.

• A population of deer must move to a new forest when its original habitat is destroyed by fire.

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NGSS.MS-LS2-4

What is a possible risk of using hydroelectricity?

• ecosystem damage and loss of land

• reduced carbon dioxide emission

• only suitable for industrial use

• creates reservoirs

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NGSS.MS-LS2-4

What is happening to the biodiversity of the aquatic ecosystem as a result of the Great Barrier Reef dying?

• Increased

• Decreased

• Stayed the same

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NGSS.MS-LS2-4

What will happen if a drought causes the population of grass to decrease?

• The population of decomposers will decrease because there are less organisms dying.

• The population of owls will not be affected because they are predators who do not eat grass.

• The population of mice will decrease because there will be less food available due to the drought.

• The population of grasshoppers will increase because they will find a different, better food source.

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NGSS.MS-LS2-4

What can happen to fish when there is not enough oxygen in the water?

• They can suffocate

• They can't float

• Nothing. Fish don't need oxygen.

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Corals die because of ________________

• boat anchors that destroy or break the corals.

• the gradual warming of the ocean's temperature

• irresponsible divers that kick the corals.

• All of the above

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NGSS.MS-LS2-4

Many different organisms live in Amanda’s garden. The diagram shows a simple food web of some of the organisms in her garden. Predation helps maintain the stability of an ecosystem. Which statement BEST describes how this garden ecosystem can benefit from the presence of snakes?

• The snakes provide an energy source for the moles.

• The snakes consume the mice best adapted to their environment.

• The snakes eat moles, which allows the population of mice to increase.

• The snakes keep the mice from overpopulating, which could deplete plant resources.

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NGSS.MS-LS2-4