Define shape and volume, particles are packed tightly together, and particles are vibrating in place

Which one of the following gases is not an important component of soil?

Describe the chemical reaction based on the chemical equation below. also, explain whether the equation is balanced.

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.