D. would be the answer because they are all within the eukaryote kingdom
The excretory system allows animals to remove metabolic waste their bodies. Many of these substances are potentially toxic. in Mammals nitrogenous toxins like urea are expelled through liquid urine while in reptiles and birds the nitrogenous compounds are expelled as a solid. This allows birds and reptiles to use less water in the processes of metabolism.
C. The brain sends messages to the spinal cord
Answer:
I think apples 6 inches from floor
Explanation:
hopefully you get it right