Most mammals use a lot of energy to evaporate sweat. The echidna does not sweat. Suggest one use of energy in the echidna's body.

The energy released by respiration is vital for many processes. In an echidna, this energy would be used for: - **Muscle contraction:** for movement when hunting for food or digging. - **Active transport:** moving substances across cell membranes against a concentration gradient. - **Synthesis:** building large molecules like proteins from smaller ones like amino acids. - **Maintaining body temperature:** when it is awake and active, it needs to generate heat to keep its temperature at ~32°C.