A student was provided with two test-tubes, one containing $10c{m^3}$ of solution P and one
containing $10c{m^3}$ of solution Q. When these solutions were mixed together and left for 24 hours, the concentration of P decreased but the concentration of Q remained the same.
The student wrote the following conclusions.
1- P may break down over time.
2- Q may be a biological catalyst.
3- P may be the substrate for Q.
Which conclusions could be supported by the information?
1, 2 and 3
2 )
1 and 2 only
3 )
1 only
4 )
2 and 3 only
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