Final answer:
Many animals were new to Lewis and Clark including the grizzly bear and the prairie dog is false because not all animals encountered by Lewis and Clark were new to them, although the prairie dog was one of the new species they documented.
Step-by-step explanation:
Many animals were new to Lewis and Clark including the grizzly bear and the prairie dog. This statement is false. While the Lewis and Clark Expedition did encounter many animals along their journey, not all were new to them.
The grizzly bear was already known, though they did indeed experience it in its natural habitat for the first time. However, animals like the prairie dog were among the new species they documented and observed in their behavior and habitat.
Their mission revealed the rich biodiversity of the Western lands traversed between 1804 and 1806 and expanded the scientific knowledge of the fauna of the North American continent.