Which era did humans first appear in? Cenozoic

Paleozoic

Jurassic

Mesozoic

What best describes emerging scientific ideas

The scales shown in the introduction measure mass, or the amount of matter in a particular object. the scientific law of conservation of mass states that matter cannot be created or destroyed during a chemical reaction, but it can change from one form to another. did the simulation support this scientific law? explain why or why not.

What are ways that ordinary people can to keep antibiotic resistance from getting worse?