Question

2. How could the duck-billed dinosaur tooth fossil lead scientists to believe that plants also existed in Antarctica?

Answer 1

Because duck-billed dinosaurs could not have survived without plants, their presence in Antarctica proves that plants existed there. Additionally, fossil plants have been found in Antarctica.

Answer 2

Since scientists know that duck billed dinosaurs are herbivores, and if they found its bones in Antarctica, they could assume that there were plants for the dinosaurs to eat.