15. Which of the following statements is NOT true? (A) Panting is a way of evaporative cooling for koalas. (B) Stretching out their limbs on the tree helps koalas save water in their body. (C) Koalas have many overactive sweat glands and are vulnerable to heat related problems. (D) Since tree trunks are cooler than air temperature, koalas lose body heat to them when hugging them