Select the correct statement about photosynthesis by primary producers.

cyanobacteria carry out more of the world's photosynthesis than protists do.
photosynthetic protists and prokaryotes carry out the majority of the photosynthesis in aquatic communities.
land plants carry out over 80% of the world's photosynthesis.

B) Photosynthetic protists and prokaryotes carry out the majority of the photosynthesis in aquatic communities.

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it has to be understood that the sea water contains a huge amount of sodium and chlorine ions and if they enter the cell of the atlantic cod fish, the cell will shrivel and the fish will die. to avoid such a condition, the fish uses active transport for the purpose of removing the ions against the gradient.

explanation:

the atlantic cod is not a maritime osmoconformer. its native application of salts is less than that of the seawater it lives in. it is continually falling water from the gills to the ocean via osmosis.

countering that, the fish is going to be swallowing seawater. but since its internal collection of salts is lower than seawater, the fish will want to go free of excess salt, and since that's going upon a gradient, then active transport, requiring energy, must be used to pump out the salt. much marine fish use the organs to filter out the salt and these fish discharge very straight urine.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.