According to the biological species concept, for speciation to occur, according to the biological species concept, for speciation to occur, the number of chromosomes in the gene pool must change large numbers of genes that affect numerous phenotypic traits must change at least one gene, affecting at least one phenotypic trait, must change changes to centromere location or chromosome size must occur within the gene pool

The answer is; at least one gene, affecting at least one phenotypic trait, must change

This change, due to mutation, may result in an extreme trait in a small proportion of the population . If this extreme trait proves to be favorable with the environment it will continue to increase in the population with every generation. Eventually, the trait will become common in most individuals and the population will have speciated.

b. heterotroph

explanation: