DNA replication occurs: a) at any time during cell division. b) immediately before prophase of mitosis. c) between the gap phases (G1 and G2) of interphase. d) during prophase of meiosis. e) during prophase of mitosis.

Explanation:

1. DNA replication is the process of DNA duplication in which one molecule of DNA is copied into two molecules with the help of DNA polymerase and various other enzymes in semi-conservative way.

2. Semi-conservative is the mode of DNA replication in which one strand is parental and one is newly synthesize in complementary way.

3. DNA replication occurs only once and once in each cell division.

4. DNA replication occurs in S phase ( phage between G1 and G2).

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.