Final answer:
Genetic variability in lizard populations allows them to adapt and survive in changing environments. Certain individuals with advantageous genes are more likely to survive and reproduce, passing on their genes to future generations. This allows populations to evolve and develop adaptations that increase their chances of survival.
Step-by-step explanation:
Genetic variability allows lizard populations to survive by providing the necessary traits and adaptations to overcome changes in their environment. When a population has genetic variability, some individuals will possess advantageous genes that allow them to better adapt to new conditions or predators. These individuals are more likely to survive and reproduce, passing on their advantageous genes to future generations.
For example, if a population of lizards is threatened by a predator, some individuals may evolve adaptations such as camouflaged coloration, sharp spines, or toxins that make them less vulnerable to predation.