Final answer:
The adaptation in green anoles' toe pads towards being larger and stickier is a result of natural selection driven by environmental changes and competition with the invasive brown anoles, allowing them to better navigate and hunt in treetop habitats.
Step-by-step explanation:
The best explanation for the change in green anoles' toe pads to become larger and stickier is due to natural selection resulting from environmental changes. The introduction of brown anoles forced green anoles to move to the tops of trees, necessitating a physical adaptation for survival. Their toe pads evolved to become better suited to the smoother and thinner branches found in their new arboreal habitat, allowing them to climb more efficiently and maintain their grip when hunting for insects. This specialization in habitat and physical features reduces competition between green and brown anoles, allowing both species to coexist in the same area.