Why was plastic first invented? How is plastic bad for the environment?​

What is the independent variable in this investigation? mass volume sample number substance density

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 many moles of oxygen gas are produced from the decomposition of six moles of potassium chlorate