Question

heart : circulatory system : _________ : nervous system fill the blank one
option a. lungs
option b. kidneys
option c. bones
option d. brain
please let me
it is so important
if you don't know that then do not tell wrong answer please ​

Answer 1

Heart : Circulatory system :: Brain : Nervous system.

Answer 2

Answer:

brain is the ryt ans......