Question

what significant discovery did jane goodall make within her first four months of observing chimpanzees?
chimpanzees could be trained to use human tools
chimpanzees were exclusively vegetarian
chimpanzees used twigs as tools to collect termites
chimpanzees could communicate with humans

Explanation:

Jane Goodall's groundbreaking discovery within her first four - months of observing chimpanzees was that they used twigs as tools to collect termites. This challenged the previous view that only humans used tools. Chimpanzees were not known to be trained to use human tools at that time, they are not exclusively vegetarian, and while they can communicate in their own ways, communication with humans was not the key discovery then.

Answer:

Chimpanzees used twigs as tools to collect termites