Scientists found a fossil of an elephant in the African savanna. It has much longer tusks and is much
larger than elephant species presently inhabiting the area. This elephant fossil most likely
reveals *

i don't know. the other person does though.

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.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

layer 3 is younger than layer 6.