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. The circulatory system picks up oxygen in the lungs and drops it off in the tissues, then performs the reverse service for carbon dioxide.
Answer:
something that happens abnormally
Answer:
because it helps them live reproduce and grow thats all I really know if its not what you want sorry.
C. “ an economic and political system in which a countries trade and industry are controlled by private owners for profit rather than by the state”
The us started the process with finding cost effective options