Final answer:
The discovery of Toumai, an early hominid fossil found in Chad dating back nearly seven million years, is significant for understanding human evolution although its exact diet and lifestyle remain uncertain.
Step-by-step explanation:
The discovery of Toumai, or Sahelanthropus tchadensis, is highly significant as it represents some of the earliest known hominid remains, dating back nearly seven million years. This fossil was found in Chad and exhibits a mix of primitive and advanced features. While its exact position in the hominid lineage and its diet are not definitively known, the presence of both evolved and archaic traits makes it a crucial find in understanding human evolution. Given that not much is known about its lifestyle or diet, it is difficult to say whether Toumai was an herbivore, carnivore, or omnivore.