Is it accurate to say that once science has answered a question, it is settled forever? yes, the scientific method works so well that once a discovery is made it never changes. yes, once a scientific "truth" is discovered there is nothing more to study about the topic. no, if new evidence is acquired or new perspectives emerge, scientific ideas can be revised or replaced. no, everything is really science so if a more appealing alternative emerges scientists will generally eliminate old ideas.

The correct answer will be option No, if new evidence is acquired or new perspectives emerge, scientific ideas can be revised or replaced.

Explanation:

Scientific research is a field of asking new questions based on the observations of the natural phenomenon and answering the real answers based on the experiments. The path of answering the questions leads to new discoveries and inventions.  

The scientific knowledge is not meant to be static but it is expanding and diversifying every day as new ideas and facts are being added to the science increasing the knowledge of the field. This edition of the new facts can change the well-established facts, which can be revised modified and changed. The established facts can be replaced with new facts even.

Thus, the selected option is the correct answer.

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.