the answer is 21<span>% oxygen, </span>
The correct option is this: HAS THE CLAIM BEEN TESTED NUMEROUS TIMES BY MORE THAN ONE SCIENTISTS.
For a claim to be accepted has been valid in the science world, it must have been tested several times by many scientists who obtain the same results. Having a uniform result about a phenomenon is usually considered an important factor when examining the validity of a claim.
Answer:
C
Explanation:
it is chemical, not physical
Answer:
these are all correct
Explanation:
i just took the quick check