Can someone me really quickly? ?
one group of gases responsible for destroying ozone in the ozone layer is
a. carbon monoxide and carbon dioxide
b. nitrogen oxides and sulfur oxides
c. cfcs
d. automobile emissions

We have a colorless transparent liquid. it looks like water. we seperated it into a solid and a liquid by evaporration and condention was this a chemichal or a physical seperation a. chemical seperation b. physical seperation

Which branches of natural science include the study of an organism that lived 10 million years ago

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?