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.
I may be wrong, but I think it's Antibodies.
Answer:
hope this helped :)
Explanation:
because when it attacks the blood cells not only is it attacking that its attacking your whole body
It takes resources when there are more animals it takes more food then when you run out of food you will have to buy more which you will run out of money its all about money without money animals will starve.
Your answer is takes resources.
