It seems that you have missed the necessary options for us to answer this question so I had to look for it. Anyway, here is the answer. What astronomers mean when <span> they say that the sun makes energy by hydrogen burning is that, the Sun is fusing hydrogen into helium and releasing energy. Hope this helps.</span>
Your stomach, as in JUST your stomach? Well the role of your stomach is to break down large clumps of food. Without that it would be very hard to impossible to digest food.<span />
