Which of the following statements is a part of dalton's atomic theory?
a) different atoms combine in simple whole-number ratios to form compounds.
b) all atoms of a given element are not identical.
c) during a chemical reaction, atoms cannot be separated, combined, or rearranged.
d) atoms can be created or destroyed.

Consider a production line with five stations. station 1 can produce a unit in 9 minutes. station 2 can produce a unit in 10 minutes. station 3 has two identical machines, each of which can process a unit in 12 minutes (each unit only needs to be processed on one of the two machines. station 4 can produce a unit in 5 minutes. station 5 can produce a unit in 8 minutes. which station is the bottleneck station?