The human nervous system is broken up into central and peripheral parts. the central system (cns) is made up of

sensory and motor neurons
the brain and motor neurons
the brain and spinal cord

c

Explanation:

The CNS is made up of the brain and spinal cord

the brain weighs .2% body weight

15% blood

20%oxygen

your answer is "the 1950's"

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.