Using examples, explain how natural selection takes place.

-Variations among living organisms can be advantageous or disadvantageous; Organisms with advantageous variations enable them to better exploit the environment; Those organisms grow to maturity, reproduce passing on beneficial variations to their offspring; hence offsprings produced are able to survive;
-Organisms with disadvantageous variations are less adapted; and therefore not able to exploit the environment; Therefore are not able to grow, reproduce and transmit their characteristics hence they are eliminated;
-For example, some strains of plasmodium parasites have a gene that makes them resistant to some antibacterial drugs; So these strains survive, reproduce and transmit the gene to the offspring; causing an increase in the population of the drug resistant strain; however, the strains without the gene for resistance are eliminated by the antimalarial drug and do not survive to reproduce;