Answer: Intentionally hyperventilating will start a positive feedback loop in which the neural controls for breathing will be upregulated.
Endoskeleton I think it's a little hard to read this question
3) fatigue
4) meditation
5) alarm
I’m pretty sure it’s the second one
I'd have to say d. the hand, because every human (for the most part, no offence intended to anyone) has a hand and is able to make good (or bad, rather) use of it. It's what a person always has access to at any given time or place, even if they don't have access to one of the other options.
