The echidna is a mammal that lives in Australia. Figure 9 shows how the body temperature of the echidna varies during the cold winter months. Give the lowest and highest body temperatures for the echidna shown in Figure 9.

By inspecting the graph: - The highest points (peaks) of the line consistently reach the same level. This level is slightly above the 30 °C mark. A reasonable estimate is 32 °C. - The lowest points (troughs) of the line are between the 0 °C and 10 °C marks, but closer to 0. A reasonable estimate is 4 °C. The question asks for one value for each, so the most representative peak and trough should be chosen.