Evolve is a term used to describe how one thing changes and become a higher form of itself so by saying that a multicellular change occurred from a unicellular change Then the correct term would be to say that it evolved
The atoms in gas are more spread out
I belive the simplest substance is a pure substance made from atoms.
Answer:
Stomata and Cuticle because it covers the outer surface of the plant and prevents drying out through evaporation.