The diversity of organisms present on earth is the result of

The diversity of organisms present on earth is the result of natural selection. members of species differs from one another in their phenotype. this variation in phenotype allows the occurrence of natural selection . Thus, natural selection works on genetic variations within a population, selecting the traits which are most adapted to the habitat.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned 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.