Determine the total pressure in a closed vessel containing N2, O2, and CO2, if the partial pressure of N2 is 4 atm, and the partial pressure of O2 is 6 atm, and the partial pressure of CO2 is 20atm?

What layer of the atmosphere is directly above the troposphere?

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

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.