Aquatic Ecosystems

What eats the phytoplankton?

• crustaceans

• shark

• mackerel

• herring

How do freshwater wetlands purify water?

• By boiling it

• By filtering pollutants

• By freezing it

• By evaporating it

What percentage of Earth's water is found in oceans?

• 3%

• 50%

• 97%

• 100%

are the largest biomes on Earth. They can be warm or cold. They are home to plants like seaweed and animals like fish, whales, turtles and sponges.

• oceans

• ponds

• lakes

• ice islands

The Blue Whale in the image above is at what trophic level?

Estuaries are affected by ______.

• tides

• earthquakes

• volcanic eruptions

• hurricanes

Phytoplankton, seaweeds and seagrasses are _______ in the ocean.

• animals

• plants

• animals and plants

Fill in the blank: _______ is a factor that impacts aquatic systems that is nonliving.

• A) Biotic

• B) Abiotic

• C) Organic

• D) Living

How does oxygen enter the water?

• Diffusion or photosynthesis

• Evaporation

• Condensation

• Filtration

Dissolved oxygen (DO) decreases as water temperature and _______ increase.

• salinity

• pressure

• volume

• clarity