Which statement is true of natural populations?

Viable populations exhibit little, if any, genetic variation.

Populations are all uniform in size.

Populations are all the individuals of a species living in a defined area.

Population is a collection of individuals of a species living in a defined area

Explanation:

Population:This is a collection of individuals of the same species occupying the same space and able to interbreed freely with one another when individuals of different sexes are brought together.

A species of animals may comprise a single cohesive population or may contain many geographical distinct populations.

Example:A population of Agama lizards in a Campus located in China.The whole human race, Homo sapiens comprising the black, Mongolian,red and white is a population.A population of Cercopithecus erythrogaster (Monkeys).

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answer: the correct option is d. enzyme

lactase and carbonic anhydrase are the examples of enzymes.

lactase is an enzyme, which is present in the small intestine of mammals. it in the digestion of the disaccharide, lactose ( milk sugar) by converting it into two monosachharide, which are glucose and galactose.

carbonic anhydrase is present in the red blood cells. this enzyme plays significant role in the transport of co₂. it in the conversion of co₂ and h₂o into carbonic acid, which is then dissociated into bicarbonate ions and hydrogen ions.