Pls help me with this question its science?

The blank under the brain is the liver,

The blank under the lungs is a stomach

The urinary system helps collect any left over fluids. these fluids could include  toxins and poisons.  

The kidneys are one organ included in the urinary system. The kidneys filter out bad fluids then send them to the bladder to be exterminated of.

On the bottom, The third box would have a 1 in it

The second box would have a 2 in it

The first box would have a 3

the fourth box would have a fourth

Hope this helps

please mark brianliest!

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answer; polycythemia is the correct answer;