Human hands are delicate and efficient instruments. each one contains 27 bones, one more than each human foot. each also contains muscles and tendons which react to nerve stimuli. it is these reactions which enable people to clench and grasp. the thumbs are, perhaps, the most important part of each human hand. they are opposable, which gives them their unique movement. besides humans, only apes have opposable thumbs. the ability to grasp is probably responsible for much of human progress.

The question is this: categorize each statement as either fact or opinion based on the passage.
A fact refers to a statement that is true and can be proofed while an opinion refers to a view point or belief of a particular person.
From the passage given above, the under listed are facts:
1. Human hands are efficient and delicate instruments.
2. Each one contains 27 bones, one more than each human foot.
3. Each also contains muscles and tendons which react to nerve stimuli.
4.It is these reactions which enable people to clench and grasp. 
5.They are opposable which give them their unique movement.
6.Besides humans, only apes have opposable thumbs.
The under listed are opinions:
1.The thumbs are perhaps the most important part of each human hands.
2. The ability to grasp is probably responsible for much of human progress.