The fossil skull of Sahelanthropus has the broad face characteristic of hominines, but it has a
brain the size of a chimpanzee's. As a result, scientists have been unable to classify this fossil Name two other pieces of fossil evidence that could help scientists classify Sahelanthropus as
a hominine.

answer; /// i do believe the correct answer is (

the fossil record provides evidence of a common ancestor to many species.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

the answer is c. it will give up it's valence electron to the other atom.