What is hypertonic and hypotonic solutions??

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics?

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels