Water Ecosystems: Question Preview (ID: 12553)

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What percentage of water of Earth is considered freshwater?
a) 2%
b) 3%
c) 4%
d) 5%

Where does most of the primary production occur in an ocean ecosystem?
a) first 50 feet
b) first 200 feet
c) first 300 feet
d) first 100 feet

Protists are the primary producers in an ocean. This would be an example of what factor?
a) food production
b) abiotic
c) biotic
d) temperature

What is an estuary?
a) where a freshwater river runs into an extension of the ocean.
b) where a freshwater river runs into an extension of a lake
c) where a freshwater river runs into land
d) where a freshwater river runs into another rive

What is the intertidal zone?
a) where the ocean meets fresh water.
b) where the ocean meets the land.
c) where the ocean meets a tide.
d) where the ocean meets a reef.

Approximately how much of the planet is covered in water?
a) one half
b) two-thirds
c) one-fourth
d) three-fourths

What is the largest ecosystem on the planet?
a) grassland
b) tundra
c) ocean
d) desert

What percentage of fish species live in freshwater ecosystems?
a) 30%
b) 40%
c) 45%
d) 35%

Where is most of the freshwater located on Earth?
a) glaciers and rivers
b) glaciers and lakes
c) glaciers and streams
d) glaciers and aquifers

___________________ are freshwater ecosystems with high biodiversity that are also declining in numbers.
a) Lakes
b) Oceans
c) Wetlands
d) Rivers

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