Natural selection is a process by which the organisms adjust to the variation in the environmental conditions so they can endure and thrive in the altered conditions.
The correct answer is:
Option C. Directional selection
This can be explained as:
- Directional selection is a negative form of natural selection in which the inhabitants of one species is favoured over another.
- The species with better trait characteristics will be favoured over the organism with less preferred attributes.
- The allele recurrence in directional assortment shifts over time.
Therefore, toads with better traits (head size) are favoured over snakes with smaller mouth sizes.
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