Changes in Ecosystems practice

How is secondary succession different from primary succession?

• Secondary succession occurs when animals are introduced to an area that had only plants.

• Secondary succession occurs over a longer period of time than primary succession.

• Secondary succession occurs after a disturbance in an area in which the soil has remained intact..

• Secondary succession occurs after a disturbance in an area that was previously uninhabited.

How do pioneer species make ecological succession possible on an island formed from volcanic eruptions?

• They use chemicals to produce food.

• They establish homes in which animals can live.

• They break down rock into soil in which plants can grow.

• They adjust the climate by altering the average temperature in a region.

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NGSS.MS-LS2-1

Ecosystems can never change once they are established.

• True

• False

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NGSS.MS-LS2-5

Ecosystems constantly change in different ways over time.

• True

• False

Ecosystems always revert back to their original state.

• True

• False

Ecosystems can exist for only a specific length of time.

• True

• False

The number and variety of organisms in a given area during a specific period of time is ________________.

• eutrophication

• carrying capacity

• succession

• biodiversity

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NGSS.MS-LS2-5

Over time, a pond can develop into a meadow. The process in which organic matter and nutrients slowly build up in a body of water is called ____________________.

• eutrophication

• climate disturbance

• acidification

• primary succession