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Aquatic ecosystems are classified based on the salinity of the water. These two ecosystems are:
oxygen
an estuary
coral reef
gills
coral reef
freshwater and marine
in water
phytoplankton
Which feature is needed in order for a pond animal to obtain oxygen from the water?
oxygen
an estuary
coral reef
gills
coral reef
freshwater and marine
in water
phytoplankton
What marine ecosystem is built by tiny animals called polyps?
oxygen
an estuary
coral reef
gills
coral reef
freshwater and marine
in water
phytoplankton
Which type of aquatic ecosystem is formed from the calcium carbonate shell secreted by animals?
oxygen
an estuary
coral reef
gills
coral reef
freshwater and marine
in water
phytoplankton
Animals with gills live ________
oxygen
an estuary
coral reef
gills
coral reef
freshwater and marine
in water
phytoplankton
Which of the following would be found at the bottom of an aquatic food chain
oxygen
an estuary
coral reef
gills
coral reef
freshwater and marine
in water
phytoplankton
Fish use their gills to get _____ from the water.
oxygen
an estuary
coral reef
gills
coral reef
freshwater and marine
in water
phytoplankton
Which aquatic biome consists of a mix of fresh water and salt water?
oxygen
an estuary
coral reef
gills
coral reef
freshwater and marine
in water
phytoplankton
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