NGSS.MS-LS2-4

Why is the mouse population changing over time?

• The light mice can reproduce more successfully than the dark mice
• The hawks eat more dark mice than light mice because the dark mice taste better
• The hawks eat more light mice than dark mice because they can see the light mice more easily
• The hawks eat more dark mice than light mice because they can see the dark mice more easily

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NGSS.MS-LS2-4

Which of the following are factors that could cause extinction?

• Destruction of animals' habitat

• Climate change

• Pollution

• Increased human population (more people)

• ALL of the above could cause extinction

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NGSS.MS-LS2-4

Invasive species can crowd out native species.

• TRUE

• FALSE

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NGSS.MS-LS2-4

Which BEST explains what would happen if decomposers disappeared in an ecosystem?

• everything would stop functioning immediately.

• everything would function normally.

• the ecosystem would become cleaner

• the ecosystem would be overrun with dead matter.

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NGSS.MS-LS2-4

Northern foxes can have different fur colors.

The foxes hunt squirrels for food. Foxes that have fur the same color as their environment are better at getting close to squirrels and catching them.

The diagrams below show three possible fox populations.

If their environment changes to have only brown dirt, which of the following fox populations will most likely survive?

• Populations 1 and 2 will most likely survive.

• Populations 2 and 3 will most likely survive.

• Only Population 2 will survive because it is the only population with variation.

• All the populations will survive because the foxes will change the color of their fur if they need to.

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NGSS.MS-LS2-4

Which would most likely cause an entire species to become extinct?

• disease

• predators

• competition for food

• limited genetic variation

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NGSS.MS-LS2-4

Scientists have been studying the size of three populations in a region. In this ecosystem, lions eat wild pigs, and wild pigs eat frogs. The data showed that all three populations were stable. Then the frog population decreased suddenly. What will likely happen to the size of the wild pig population as a result?

The size of the wild pig population will . . .

• increase

• stay the same

• decrease

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NGSS.MS-LS2-4

If a lake has excess levels of phosphates and nitrates in its water, what will most likely result?

• The temperature of the lake water will decrease.

• The turbidity levels of the lake will decrease.

• The dissolved-oxygen levels in the lake will increase.

• The growth of algae in the lake will increase.

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NGSS.MS-LS2-4

Cutting off trees at large scale leads to

• Deforestation

• Afforestation

• Reforestation

• Both deforestation & afforestation

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NGSS.MS-LS2-4

One CON / DRAWBACK of hydroelectric power is that dams can

• create lakes

• control irrigation

• block routes for fish

• keep soil rich

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NGSS.MS-LS2-4