NGSS.HS-LS2-6

Reestablishing a damaged ecosystem where even the soil was destroyed...

• Secondary succession
• Primary succession
• Carrying capacity
• Homeostasis

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NGSS.HS-LS2-6

The role of an organism in its environment.

• habitat
• niche
• community
• species

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NGSS.HS-LS2-6

Algal blooms and eutrophication are usually caused by

• increased N and P from agricultural runoff from fertilizers
• the average increase in temperature globally
• the thermohaline circulation 
• CO2 emissions from burning fossil fuels

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NGSS.HS-LS2-6

If a disease strikes the snakes the grass will

• increase

• decrease

• not be affected

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NGSS.HS-LS2-6

Overgrazing of grasslands can lead to reduced range quality. Two of the major effects of overgrazing are

• erosion and desertification

• eutrophication and increased methane production

• higher fire potential and increased productivity

• higher primary productivity and ammonification

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NGSS.HS-LS2-6

What are keystone species?

• Non-native species that have adapted to a new environment

• Species that have disproportionate effects on ecosystem stability

• The first species to return to an area after a natural disaster

• Organisms that can collapse an ecosystem if they overpopulate an area

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NGSS.HS-LS2-6

Based on the graph shown, how can you tell sea otters are a keystone species?

• as the sea otter population decreases, biodiversity increases
• as sea otter population increases, biodiversity increases
• changes in the sea otter population have little effect on biodiversity 
• the sea otter population dereases due to the presence of urchins

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NGSS.HS-LS2-6

In some environments, wolves prey on deer for their source of food. If all of the wolves were taken from the environment, what would most likely happen to the deer population?

• A The deer population would increase and begin to compete for food.

• B The deer population would become larger and healthier animals.

• C The deer population would decrease, because there would be an increase in disease.

• D The deer population would change color, because they would not have to hide from wolves.

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NGSS.HS-LS2-6

A series of progressive changes in the composition of an ecological community over time

• Climax Community

• Primary Succession

• Ecological Succession

• Species Richness

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NGSS.HS-LS2-6

The following food chain exists in a marine ecosystem: phytoplankton→zooplankton→Fish. If seals that eat fish are added to the ecosystem, what would happen to the phytoplankton population?

• The phytoplankton population would increase

• The phytoplankton population would decrease

• The phytoplankton population would remain the same

• The phytoplankton population would become extinct

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NGSS.HS-LS2-6