Compounds like the pesticide DDT may bring about the evolution of new strains of organisms by ... ?

(1) destroying food producers

(2) acting as natural selecting agent

(3) mixing two different sets of genes

(4) creating new ecological niches

(2) acting as natural selecting agent

Explanation:

Compounds like the pesticide DDT may bring about the evolution of new strains of organisms by acting as a natural selecting agent.

Evolution is generally defined as a gradual change to the characteristics of organisms over a period of time.

When DDT is used on a particular population of pest, those that are weak within the population die off, leaving only those that are strong within the population to survive and multiply. The DDT acts a selecting agent for the survival gene in the pest and the survived gene eventually evolve into a new, DDT-resistant strain pest in no time.

The correct option is option (2).