Final answer:
The continents were once closer together because of a supercontinent called Pangaea. Evidence such as the fossil of a plant called Glossopteris found on multiple continents indicates that they were once connected.
Step-by-step explanation:
It is thought that the continents were once closer together due to evidence of a supercontinent called Pangaea.
One piece of evidence is the fossil of a plant called Glossopteris that was found in South America, Africa, India, Antarctica, and Australia.
These continents are now separated by large bodies of water, but the presence of the same fossil on multiple continents suggests that they were once connected. This supports the theory of continental drift and the idea that the continents were once closer together.