Use Table 6.1 to show how each response helps keep core temperature within narrow limits.
Animals can also use behaviour to cope with changes in temperature. Suggest why some animals curl up their bodies in cold weather.
The Sitatunga deer, $\textit{Tragelaphus spekii}$, and the Nile monitor lizard, $\textit{Varanus niloticus}$, live in Africa. An experiment measured the core temperature of the Sitatunga and the Nile monitor as environmental temperature was increased. The findings are shown in Fig. 6.3. (i) Describe the results in Fig. 6.3. (ii) At low environmental temperature, Nile monitors are fairly inactive. Suggest one disadvantage to the Nile monitor of being inactive.
Thermoregulation depends on negative feedback. Explain what is meant by negative feedback.