You can tell that a chemical reaction occurred if there's bubbles, fumes and or evaporation. (:
Democritus developed the atomic model. He theorized that atoms were specific to the material which they composed. He also believed that the atoms different in size and shape, were in constant motion in a void, collided with each other; and during these collisions, could stick together.
Pretty sure it’s ,B. Microscope!
Answer:
friction
Explanation:
the resistance that one surface or object encounters when moving over another.
