Answer: Cross-contamination
Explanation: it is the transfer of harmful organisms from one surface to another that is often the cause. This is especially troublesome for raw, ready-to-eat foods, such as salads or other produce.
1.First notes above treble clef staff are G, A, B, C
2.First notes below treble staff are A, B, C, D
3.First notes above bass clef staff are B, C, D, E
4.First notes below bass clef staff are C, D, E, F
D........................................
