What are the reactants in the equation for cellular respiration?

The reactant are oxygen and carbohydrate (glucose).

Cellular respiration is a redox reaction that extracts energy from glucose. We will have a controlled release of the free energy of organic compounds from the cells to form ATP.

Can be done in the presence (aerobic) or absence (anaerobic) of oxygen.

The aerobic reaction will produce carbon dioxide (CO2) and water (H2O).

a physical change is being made.

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.