Atestable hypothesis could be formed from which question?
are bass more active in the daytime than at night?
when whales jump out of water, are they happy?
are red tulips prettier than tulips of other colors?
why are gerbils more popular as pets than hamsters are?

Are bass more active in the daytime than at night?

Explanation:

A testable hypothesis is one which is based upon a proposed explanation including the facts about a natural phenomena or natural event which can be tested upon by using suitable methodology.  

Among the options given, Are bass more active in the daytime than at night? is the correct one. This is because of the fact that activity of the bass can be observed and measured in the day as well as in night therefore, this will involve a scientific methodology which can be used to appropriately answer the question.

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.