Identify the four postulates of natural selection. 1. All individuals in a population have equal reproductive success. 2. Individuals in a population vary in the traits they possess. 3. Individuals in a population all possess the same traits. 4. Individuals with certain traits are more likely to survive and reproduce. 5. Survival and reproductive success are variable among individuals in a population. 6. Some trait differences are heritable.

The four postulates of natural selection are-All individuals in a population have equal reproductive success,Individuals in a population vary in the traits they possess,Survival and reproduction success are variable among individuals in a population,Some trait differences are heritable.

Explanation:

Natural selection is a process by which those organisms that adopt the environmental condition have the chance to increase in number and those organisms that are unable to adopt the environmental condition will be less favorable.

Natural selection have 4 conditions that are Reproduction,Heredity,Variation in fitness of organisms and variation in traits of the individuals.

Reproduction-is a condition which is important for evolution as the parent produce offspring that will survive.

Heredity-is a kind of mechanism when the transmission of genetic information takes place from parent to offspring.

Variation is important as it considers the fitness of organisms as they have different heritable factors.

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.