Which system plays the smallest role in movement of the human body?

Color blindness is a recessive trait. the gene for color blindness is on the x chromosome. the family tree below shows the trait of color blindness. the only unknown is the mother in the first generation

What are the responsibilities of the region of the brain highlighted below? =+= will rate brainiest =+=

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks