Question

required information
temperature effects on enzymes
rate of reaction
high
low
enzyme from human
enzyme from hot springs bacterium
human body 37°c
30 40 50 60 70 80
temperature (°c)
data curves for temperature vs. reaction rate
the two data curves on the figure illustrate that

Explanation:

The graph shows that enzymes from different sources (human and hot - springs bacterium) have different optimal temperatures for reaction rate. Human enzymes have an optimal temperature close to human body temperature ($37^{\circ}C$), while enzymes from hot - springs bacteria have a higher optimal temperature. This illustrates that enzymes are adapted to the temperature environments of their source organisms.

Answer:

Enzymes from different organisms are adapted to different temperature environments, with their optimal reaction - rate temperatures reflecting the typical temperatures of their habitats.