A jellyfish would be considered a type of ____.

Strongly swimming consumers are most likely to be ____.

The single ocean on the earth is divided into four parts by the continents. Which of the following is not one of those parts?

What prevents coral reefs from surviving below the euphotic zone?

Which of the following is not part of the saltwater or marine aquatic life zones?

Which of the following is classified as a freshwater aquatic life zone?

Net Primary Productivity is highest in ____.

Which of the following is a major cause of increasing ocean acidification?

Which of the following is not part of the coastal zone?

What is the coastal marine ecosystem consisting of at least 60 species of plants that grow underwater in shallow marine and estuarine areas along most continental coastlines?

Which of the following is a highly productive wetland that provides habitat for some 69 species of trees that can live in salty water?

What is an area where a river meets the sea, and includes some of the earth’s most productive wetlands?

Organisms in ____ must be able to avoid being swept away, crushed by waves, or being left high and dry at low tides, and must survive daily or seasonal salinity and temperature changes.

The deepest part of the ocean is the ____.

Most photosynthesis in the open ocean occurs in the ____.

The dimly lit zone in which zooplankton and smaller fishes predominate is the ____.

In certain areas of the open sea, winds, ocean currents, and other factors cause water to come up from the depths to the surface, bringing nutrient from the ocean bottom. This process is called a(n) ____.

The zone in which you would expect to find deposit feeders along with oysters, clams, and sponges is the ____.

The ocean zone that covers the continental shelf is the ____.

The ocean zone that makes up less than 10% of the world's ocean area, yet contains 90% of all the marine species, is the ____.

Which human activity is least likely to be a major threat to marine systems?

Which of the following is not a type of inland wetland?

In large lakes, there are four distinct zones. Which of the following is not one of those zones?

The open, sunlit surface area away from the shore is in which zone?

In lakes, the nutrient-rich water near the shore is part of the ____.

Humans have built dams and levees on many of the world’s rivers to control water flows. These structures ____.

Fish adapted to cool, dark waters in lakes are found in the ____.

Which of the following would be characteristic of the profundal zone?

Deep lakes with steep banks that have a short supply of plant nutrients are ____.

Which of the following would be characteristic of a eutrophic lake?

In lakes, large numbers of decomposers are found in the ____.

If you fish for trout, you would be most likely to seek out which part of a stream?

Wide, slow-moving rivers containing lots of particulate matter (silt) would be typical of what aquatic life zone?

Four of the following are ecological and economic services provided by inland wetlands; one is not. Choose the one that is not.

Most of the wetlands that are lost are used for ____.

Since 1960, Chesapeake Bay has suffered from water pollution. What is a major cause of this?