Passenger airplanes take off in the troposphere but can eventually move into the stratosphere. The planes may remain in the stratosphere until it is time to
land. Why do you think planes fly in the stratosphere?

it stays there bc there are turbulance which is in the troposphere. The air in the stratosphere has very little water vapor, so there are no interactions with the jet/plane.

because the light is a great source of energy for the plants to survive. (i hope this )

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.