Final answer:
Plant-pollinator coevolution involves long-term changes in both the plant and the pollinator, aiding their survival and reproduction. The Red Queen Hypothesis is best supported by the scenario where an asexual snail population dies out after being invaded by a parasite.
Step-by-step explanation:
The correct statement is that Plant-pollinator coevolution involves changes in both species over a long period of time that help both the plant and the pollinator survive and reproduce. Coevolution is the process where two or more species evolve in response to each other's evolutionary changes. This is often seen in the symbiotic relationships between flowering plants and their pollinators. For example, plants may evolve specific flower shapes and scents that attract particular pollinators, while those pollinators may evolve mouthparts or behaviors that enable them to effectively obtain nectar or pollen from those plants. These adaptations occur over many generations, reflecting the long-term nature of evolutionary processes.
Considering the Red Queen Hypothesis, which suggests that organisms must constantly adapt and evolve to survive in the face of coevolving organisms, the best support would be the scenario where Individuals of a snail population that reproduce asexually die out after a parasite invades its territory. This is because the lack of genetic variation in asexual reproduction may hinder the ability of the snail population to adapt to the new challenge posed by the invading parasite, leading to their eventual extinction.