Which statement best explains section X?

• competition does not occur between members of different species in the same habitat

• energy is used for interbreeding between members of different species

• the population has reached the carrying capacity of its environment

• a predator recycles the remains of dead organisms

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NGSS.MS-LS2-1

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When water used to cool machinery is returned to a river, it raises the river water temperature. This causes a sharp decline in small invertebrate populations. Based on the food web, a likely consequence of this change would be:

• an increase in the number of clams.

• an increase in the number of water plants.

• an increase in the number of crayfish.

• an increase in the number of crabs.

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

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A chemical pesticide was put on an area of the ecosystem to the right by a landowner to control the mouse population. There was a decrease in the mouse population due to the use of this pesticide.

Which one of the following would most likely happen first because of this change in the ecosystem?

• The amount of grass would decrease

• the snake population would increase

• The snake's food supply would increase

• The rabbit's food supply would increase

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NGSS.MS-LS2-1

NGSS.MS-LS2-3

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The harvest mouse population is

decreasing. A reason for this

decrease might be that ____.

• the song sparrow population has increased.

• the smelt population has decreased.

• the marsh hawk population has increased.

• the snail population has decreased.

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

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Food, water, sunlight, air, soil are resources that are often __________.

• limiting factors

• wet

• messy

• found in rocks

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NGSS.MS-LS2-1

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The number of individuals a habitat can sustain with the resources it has available

• Carrying capacity

• Limiting factors

• Resources

• Population

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NGSS.MS-LS2-1

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Nonliving parts of an ecosystem

• Biotic

• Abiotic

• Prebiotic

• Nonbiotic

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The living parts of an ecosystem

• Biotic

• Abiotic

• Antibiotic

• Probiotic

All members of one species in a certain area.

• Population

• Limiting Factors

• Immigration

• Birth Rate

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NGSS.MS-LS2-4

If there is more food than usual in an ecosystem, then...

• Populations will stay the same

• Populations will decrease

• Populations will increase

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4