Nitrogen has a half life of 10 days. if you have a 75 gram sample how much is remaining after 20 days ?

Which feature do highland climates have that lower elevation areas do not?

Stage in which a star’s outer layers have started to cool and grow outward?

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.