Conditions under which natural selection occurs in a population of tortoises are described in the table below: Natural Selection Description Condition Description A The population comprises smaller adult tortoises and larger adult tortoise B Food is scarce on the island where the population is present Which factor contributes to natural selection for each condition? Condition A and Condition B represent competition. Condition A and Condition B represent inherited variation. Condition A represents competition, and Condition B represents inherited variation. Condition A represents inherited variation, and Condition B represents competition.