#循環養分
#排出氣體
#維持體內平衡
#保護免受化學物質危害
#Cycle nutrients
#Expel gases
#maintain homeostasis
#Protect from chemicals
外骨骼排泄含氮廢物 (Exoskeletons excrete nitrogen waste)
等足蟲的外骨骼藉由排泄氨氣以移除含氮廢物
(Exoskeletons of woodlice help them remove waste by excreting gaseous ammonia.)
