This type of aquatic ecosystem is a mix of fresh and salt water.

• estuary
• lake
• river

One of the benefits of wetlands, is that they can

• replace lakes and ponds
• filter pollutants out of water
• provides land for housing developments

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Organisms in estuaries must be able to survive

• frequent dry conditions
• high winds
• changing salt levels

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Which is a fresh water ecosystem?

• river
• estuary
• ocean

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Aquatic ecosystem that has a thin layer of water covering soil that is wet most of the time is called ____.

• wetland
• estuary
• lake
• puddle

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What factors affect aquatic ecosystems? 

• Light, salinity, temperature
• Sun, moon and stars
• Nothing
• Coral reefs, whales

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Which factor(s) affect aquatic ecosystems?

• depth
• flow
• nutrients
• all affect aquatic ecosystems

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Why does photosynthesis not occur in the deep ocean? 

• Lack of nutrients
• Low oxygen levels
• Excess sunlight
• Sunlight does not penetrate

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Deep ocean technology has discovered organisms in hydrothermal vents that do not rely on sunlight to survive. What do these organisms use as their energy source?

• chemosynthesis
• electrical charge
• hydropower
• thermal heat

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In what zone does approximately 90% of all ocean life live?

• photic

• aphotic

• abyssal