What must be the same on each side of a chemical equation, because of the law of conservation of matter?
A. The number of molecules of each compound
B. The total number of molecules
C. The number of atoms of each element
D. The total number of elements
SUBMIT

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?