Question

Which factors affect natural selection?
inheritance, isolation, adaptation
variation, overpopulation, adaptation
isolation, overpopulation, speciation
variation, inheritance, speciation

Answer 1

Best answer from the list: variation, inheritance, speciation (option 4).

Clarification: the key requirements for natural selection are
- variation among individuals,
- those variations being heritable (inheritance),
- differential survival/reproduction driven by overproduction/competition and environmental pressures.

Speciation and adaptation are usually outcomes of natural selection, not causes.