Is this negative feedback or positive feedback? When a human increases physical activity, the amount of fuel burned in its cells also increases, which in turn increases the concentration of dissolved
CO2 in the blood. The CO2 reacts with water in the blood to make a weak acid,
which lowers the pH of the blood, Sensory cells in the medulla of the brain
register this drop in pH and send signals to the diaphragm and heart to
increase respiration. This will clear the CO2 from the bloodstream.

the answer is golgi apparatus

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.

the answer would be   10%