A scientist is studying two previously undocumented organisms to determine how environmental conditions affect phenotype expression. In one study, the scientist determines how temperature affects the growth rate of these two organisms. The graph below depicts the data gathered by the scientist: Based on the data collected by the scientist, which of the following is the most appropriate conclusion?

a) The two organisms are different sizes.
b) The two organisms are from different species.
c) They have the same genome response to temperature.
d) They occupy the same niche.