I believe it is a microscope
That's hard. The action might be when you go to lift your feet off the ground and the reaction force is letting your feet touch the ground again while taking a stride. Hope this helps.
Respiration occurs when glucose<span> (</span>sugar<span> produced during photosynthesis) combines with </span>oxygen<span> to produce useable cellular energy. This energy is used to fuel growth and all of the normal cellular functions. </span>Carbon dioxide<span> and water are formed as </span>by-products<span> of respiration.</span>
