If you test more than one variable in an experiment at a time than you wouldn't know what variable caused the change in the end.
Answer:
Option 2 and 4
Explanation:
i think it is option 2 and 4 because it tells us what a character does :)
I would guess C, hope that helps!
Answer;
-Structural isomers.
Explanation;
-Isomers are molecules that have the same molecular formula, but have a different arrangement of the atoms in space.
-Structural Isomers are molecules which have the same molecular formula but have different connectivities. That is; the molecules have the same molecular formula, but their atoms have different arrangements or bonds.
-For example, butane and isobutane are structural isomers, also called chain isomers. In chain isomers, the carbon atoms are connected in different orders. Isobutane and butane have a molecular formula of C4H10.