Which of the following statements is true?

compounds keep the chemical properties of the elements they are made from.

molecules are made of two or more atoms.

john dalton was the first person to propose the idea of an atom.

all of the above.

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).