Why are endospores used to measure the effectiveness of autoclave sterilization?
A. Endospores are easy to store in the lab until needed.
B. Endospores are very simple structures and easy to detect.
C. Endospores are very hard to kill.
D. Endospores are composed of all the molecules found in living cells.
E. Endospores of different bacteria are destroyed at different temperatures and can be used to calibrate autoclave temperatures.
Answer: C
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approximately
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Fill in the blank(s) with the appropriate word(s).