Biomes

How do gills help fish survive in aquatic ecosystems?

• They help fish move through the water.

• The regulate the body temperature of fish in cold waters.

• The move dissolved oxygen from the water into the systems of fish.

Overfishing has threatened fish in which aquatic ecosystem?

• Estuaries

• Open Oceans

• Coastal Oceans

A stream is:

• a warm, shallow, freshwater body that is high in nutrients.

• where freshwater in rivers meets salt water in oceans.

• a narrow, often fast-flowing body of freshwater.

• an area that has a thin layer of water over soil that is wet most of the time.

Which of the following is a warm, shallow, freshwater body that is high in nutrients?

• Stream

• Wetland

• Pond

• Estuary

An estuary is...

• a warm, shallow, freshwater body that is high in nutrients.

• where freshwater in rivers meets salt water in oceans.

• a narrow, often fast-flowing body of freshwater.

• an area that has a thin layer of water over soil that is wet most of the time.

Which of the following is an area that has a thin layer of water over soil that is wet most of the time?

• Estuary

• Wetland

• Stream

• Pond

Which of the following has organisms that are adapted to surviving in open air and heavy waves?

• Twilight zone

• Intertidal zone

• Sunlit zone

• Coral reef

Which of the following is where many fish swim from here to the ocean surface at night to feed?

• Twilight zone

• Intertidal zone

• Sunlit zone

• Coral reef

Which of the following is a structure in shallow, tropical waters that is made of animal skeletons?

• Twilight zone

• Coral reef

• Coastal ocean

• Sunlit zone

Which of the following is an ocean zone that has abundant algae and other producers?

• Twilight zone

• Intertidal zone

• Sunlit zone

• Farming zone