Which of the following phrase best defines what an ecosystem is? a. an ecosystem is all of the biotic and abiotic factors in a given area b. an ecosystem is all the organisms living in a given area c. an ecosystem is a large area with a certain temperature and amount of rainfall d. an ecosystem is all individuals of the same species in the same area

The answer is A because:

B is a community

C is wrong because an ecosystem needs life

D is a population

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.