The x-axis shows the temperature and the y-axis shows the killing time. This is with respect to spores in a suspension. Curve a = 100,000 spores/ml and b= 1,000 spores/ml. Above curve a is the region of spores killed and below the region b is the region of spores survived. Which of the following do we comprehend from the above?

• A. Greater the spore concentration, more heat resistant the suspension
• B. Spores of a given strain, all have the same heat resistance
• C. Spores of the same strain have many spores of low heat resistance
• D. Spores of the same strain have very few spores of high heat resistance