No new substance is produced
physical or
chemical change

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.

How does the motion of particles in a gas change as the gas cools

Which of the following describes a situation where competition between producers exists