Final answer:
The statement is false. The evolution from a five-toed ancestor to the modern one-toed horse is false evidence that evolution makes organisms less complex over time; it demonstrates adaptation to specific environmental needs.
Step-by-step explanation:
The statement that the evolution of the horse demonstrates that organisms become less complex over time is False. Evolution does not necessarily lead to a reduction in complexity; rather, it leads to changes that can increase or decrease complexity depending on what adaptations are most beneficial for survival in a given environment. The transition from a five-toed ancestor to a modern horse with a single toe (hoof) reflects adaptation to their environment for greater speed and efficiency rather than a general trend toward simplicity. Horses evolved to become taller allowing them to see predators while feeding in tall grasses, and their molars developed to be able to grind tough grasses effectively.