How is it possible that only 92 elements are found in the natural world but there are millions of different types of molecules?

You are confusing elements - atoms - and molecules. There are indeed 92 natural elements, H to U. Each element appears as individual atoms, such as hydrogen atoms, carbon atoms, etc. These individual atoms can and do bond with each other to make molecules, such as methane CH4, water H2O, etc. I hope you are not confused anymore.

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.