Question

What body systems are used to pick up a pencil?

Answer 1

The systems are:

Nervous system: this is because the brain sends out commands to the body or it signals other parts which makes your body move like walk or to pick something up.

Muscular system: the muscular system such as your bones and muscles is what keeps the bones together so you could move/walk.  

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Answer 2

Nervous - vision, cooperation for muscles (hands and arms)
Muscles - the muscles are the motors of the body which we use to move/hold objects