Question

what is the next step in this experimental design?
repeat the exact same thing again
sequence more of the samples
figure out how the mutations are helping the bacteria tolerate the heat
see how hot you can make the bacteria before they die

Explanation:

The process involves bacteria, DNA, and heat - tolerance. After observing and analyzing DNA changes, the next logical step is to understand how mutations aid heat - tolerance.

Answer:

figure out how the mutations are helping the bacteria tolerate the heat