fossil - n. something (such as a leaf, skeleton, or footprint) that is from a plant or animal which lived in ancient times and that you can see in some rocks

species - n. a group of animals or plants that are similar and can produce young animals or plants : a group of related animals or plants that is smaller than a genus

jaws - n. either one of the two bones of the face where teeth grow

cranium - n. skull

jut out - phrasal verb. to stick out, up, or forward

evolution - n. a theory that the differences between modern plants and animals are because of changes that happened by a natural process over a very long time

anthropology - n. the study of human races, origins, societies, and cultures

overlap - n. a part or amount that happens at the same time as something else