What is one way that rna differs from dna?

Both DNA and RNA are the types of nucleic acid which play an important role as the genetic material of the organisms.

Although both are nucleic acid but they can be easily distinguished on the basis of their composition as both contain a five-carbon sugar but DNA sugar called deoxyribose lack an -OH group which is present in the RNA molecule.

Also, the nitrogenous base of these molecules differ as the DNA posses adenine, guanine, cytosine and thymine whereas RNA posses uracil instead of thymine.

Thus, RNA and DNA differ from each other.

the answer to your question is tooth decay.

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.