Catch the killer worksheet

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

b.have there own function.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex