Carbon dioxide and what state it doesn’t make no sense
I believe that it is all of the above.
"A Scientific Hypothesis Must Be "Falsifiable". A scientific hypothesis must be testable, but there is a much stronger requirement that a testable hypothesis must meet before it can really be considered scientific."
I hope this helped, have a nice day!
I know for number 4 the answer is c, sorry I can't help with the others.
The answer is 5.4! I found it on a an online calculator!