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Use the food web diagram to answer the question. Which organisms in the food web are competing for the same food resource?

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NGSS.MS-LS2-1

In the ocean, a sea anemone attaches itself to the shell of a hermit crab. The stinging arms of the sea anemone protect the hermit crab, while the movement of the hermit crab brings food to the sea anemone. Which best describes the relationship between the sea anemone and the hermit crab?

• coexistence

• mutualism

• competition

• parasitism

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NGSS.MS-LS2-2

This energy pyramid model the flow of energy between organisms. Use the diagram to help you answer the question.

• The energy needs of organisms increase from level to level in an ecosystem. With each level of the pyramid, only 10% of the energy available is used by organisms.

• The energy needs of organisms decrease from level to level in an ecosystem. With each level in an ecosystem transferring only 10%. This means that the remaining 90% is the energy used and lost as heat.

• The energy needs of organisms increase from level to level in an ecosystem. Therefore, the total amount of energy available at each level increases in an ecosystem.

• The energy needs of organisms do not flow from level to level in an ecosystem. Therefore, the total amount of energy stays the same in an ecosystem.

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NGSS.MS-LS2-3

Interactions among organisms can:

• create stability within ecosystems

• facilitate or restrain (limiting factors) growth

• enhance or limit the size of populations

• maintaining the balance between available resources and those who consume them

• change only biotic factors

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Plants use CO2 in the process of ___________________ to make ___________ and oxygen.

• cellular respiration, water

• photosynthesis, glucose (sugar)

• photosynthesis, water

• cellular respiration, glucose (sugar)

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A lion is at the top of the food chain, where it is responsible for eating numerous animal species. The lion's job in its ecosystem is to help control the population of other animals in the ecosystem by hunting and eating them. Which of the following best describes the role of a lion within its ecosystem?

• The one in which all species are in balance

• The one in which there are no animals

• The lion’s niche as a predator within the ecosystem

• The lion's niche as decomposer within the ecosystem

The table below shows information about two mammals that live in forests in North Carolina. Use the table below to answer the question. What is most likely the relationship between the two animals?

• commensalism

• coexistence

• cooperation

• symbiosis

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NGSS.MS-LS2-2

Which is an abiotic factor that would affect the growth of a population within an ecosystem?

• The availability of water would affect the growth of a population within an ecosystem.

• The availability of producers would affect the growth of a population within an ecosystem.

• The type of herbivores present would affect the growth of a population within an ecosystem.

• The number of carnivores present would affect the growth of a population within an ecosystem.

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List 3 biotic factors in an ecosystem.

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List 3 abiotic factors in an ecosystem.

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