What is the percent composition of Al in AlBr3?

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils. the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?

Which element is least likely to undergo a chemical reaction