Kidney preserve or excrete H⁺ ion and HCO₃⁻ ion to regulate the blood pH.
Answer:
hydroshpere and biosphere
Explanation:
it contains
hydrosphere: cleaning of water
biosphere: helps plants and animals
B. Reproductive organs are formed by the body
I believe it's photosynthesis.
Just as the organs in an organ system work together to accomplish their task, so the different organ systems also cooperate to keep the body running. For example, the respiratory system and the circulatory system work closely together to deliver oxygen to cells and to get rid of the carbon dioxide the cells produce.
