The correct answer is "All the options."
Natural selection is based on several key conditions:
- Individuals vary in their characteristics: Variation within a population is essential for natural selection to act upon.
- All organisms produce more offspring than can survive: This leads to competition for resources and survival.
- Individuals vary in their reproductive fitness: Some individuals are better suited to their environments and can reproduce more successfully than others.
All these factors contribute to the process of natural selection.