Which substance is considered a building block for all living things?

hydrogen

glucose

carbon

protein

The correct answer would be carbon.

Carbon is one of the most abundant elements found in the biosphere and forms the building block of life on Earth.

Ability to make four bonds enables the carbon to serve as the primary component of most of the organic material including major macromolecules (such as carbohydrate, proteins, lipids as well as nucleic acids).

it's c. (to reduce the greenhouse effect/carbon gasses)

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.