There are 12 pairs of curved bones called X in our chest region. One end of bones X is joined to
backbone and their other end is joined to bone Y in
front to form a box-like structure Z. This strong box
like structure protects the delicate internal organs P and
Q.

What are X, Y and Z?
Name the organs P and Q

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answer; i believe that the correct answer is; ///bodies of water store heat during the day and release it at night;

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.