Is there a way to lock a cell from edit or delete after a person has entered
data into it?

I am using Excel as a survey tool in a class. Each student will create a
survey and then the students will rotate around the lab and take each
student's survey. I don't want a student messing with the former student's
data by changing the answer. Therefore I need to lock or hide the answer
after the student entered it.
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Thanks As Always
Rip