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Which feature is needed in order for a pond animal to obtain oxygen from the water?
benthic
freshwater and marine
an estuary
in a coral reef
oxygen
coral reef
coral reef
gills
Which type of aquatic ecosystem is formed from the calcium carbonate shell secreted by animals?
benthic
freshwater and marine
an estuary
in a coral reef
oxygen
coral reef
coral reef
gills
What marine ecosystem is built by tiny animals called polyps?
benthic
freshwater and marine
an estuary
in a coral reef
oxygen
coral reef
coral reef
gills
Aquatic ecosystems are classified based on the salinity of the water. These two ecosystems are:
benthic
freshwater and marine
an estuary
in a coral reef
oxygen
coral reef
coral reef
gills
In an ocean ecosystem, the greatest diversity of organisms is found:
benthic
freshwater and marine
an estuary
in a coral reef
oxygen
coral reef
coral reef
gills
Which aquatic biome consists of a mix of fresh water and salt water?
benthic
freshwater and marine
an estuary
in a coral reef
oxygen
coral reef
coral reef
gills
The part of the ocean where the water is too deep for sunlight to penetrate to the bottom is called the _____zone.
benthic
freshwater and marine
an estuary
in a coral reef
oxygen
coral reef
coral reef
gills
Fish use their gills to get _____ from the water.
benthic
freshwater and marine
an estuary
in a coral reef
oxygen
coral reef
coral reef
gills
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