How were democritus's ideas similar to dalton's? . a. they both thought that atoms could be broken down into smaller particles.. b. they both studied the charge on electrons.. c. they both thought that atoms could not be broken down into smaller particles.. d. they both understood that electrons were parts of atoms..

C. They both thought that atoms could not be broken down into smaller particles

Explanation:

Democritus and Dalton both believed that atoms are the tiny invisible particles. These are the smallest particles in nature. These exists permanently in nature without changing. These atoms are so tiny that they cannot be broken down into sub-particles. The atoms made up of different materials are said to be different in nature. Hence, C is the correct option.