Which of these is a characteristic of sexual reproduction?
a) it takes place in all cells of the body.
b) it forms exact copies of the parent cell.
c) it results in offspring with genetic variation.
d) it requires only one parent to form a daughter cell.

The answer is C

Sexual reproduction results in the fusion of male and female reproductive cells. A zygote is formed containing information from two separate parents. What chromosomes are present in each gamete or sex cell is randomly assorted. Thus sexual reproduction and fertilization results in offspring with genetic variation.

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.