NGSS.MS-LS2-4

After the Aswan High Dam was built on the Nile River, the rate of parasitic blood-flukeinfection doubled in the human population near the dam. As a result of building the dam, the flow of the Nile changed. This changed the habitat, which resulted in an increase in its population of a certain aquatic snail. The snails, which were infected, released larvae of the fluke. These larvae then infected humans. This situation best illustrates that:

• the influence of humans on a natural system is always negative in the long term
• the influence of humans on a natural system can have unpredictable negative impacts
• human alteration of an ecosystem does not need to be studied to avoid ecological disaster
• human alteration of an ecosystem will cause pollution and loss of finite resources

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NGSS.MS-LS2-4

Any thing or organism that regulates the size of a population of another organism is known as __________.

• a limiting measure
• a limiting factor
• factorization
• materialization of precipitation

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NGSS.MS-LS2-4

Which is the most likely to occur due to depletion of trees in an ecosystem?

• decreased runoff
• increased erosion
• decrease flooding
• increased biodiversity

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NGSS.MS-LS2-4

Under which condition are large numbers of fish in a lake likely to die?

• when the water's dissolved oxygen is low and temperature is high
• right after a storm with heavy rainfall

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NGSS.MS-LS2-4

Living organisms, including humans can change their environment.

• True
• False

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NGSS.MS-LS2-4

Why couldn't the Swomee-Swans sing after the trees began to be cut down?

• They ate too much.

• They were tired.

• They had smog in their throats.

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NGSS.MS-LS2-4

Temperature of the water impacts

• what kind of organisms can live in rivers, creeks and lakes.

• the amount of dissolved oxygen.

• the amount of minerals dissolved in the water.

• all of the above

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NGSS.MS-LS2-4

Lions and cheetahs prey on wildebeests that graze in the grasslands of the African savanna. What likely effect would increased rainfall over several rainy seasons have on the populations of wildebeests, lions, and cheetahs?

• All three populations would increase.

• The wildebeest population would decrease, and the lion and cheetah populations would increase.

• The wildebeest population would increase, and the lion and cheetah populations would decrease.

• All three populations would decrease.

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NGSS.MS-LS2-4

Fishermen have harvested certain fish to the point where the population of that fish is decreasing. This level of direct harvesting could cause

• the restoration of environmental stability

• ecosystems to be improved for future generations

• ecosystems to be severely damaged

• all other fish species to increase in number

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NGSS.MS-LS2-4

Anything that prevents a population from growing too large.

• Biotic Factor

• Limiting Factor

• Abiotic Factor

• Ecosystem

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NGSS.MS-LS2-4