Which organelle converts the chemical energy stored in food into compounds that are more convenient for the cell to use?

What does the process of natural selection involve

Which buffer would be better able to hold a steady ph on the addition of strong acid, buffer 1 or buffer 2? explain. buffer 1: a solution containing 0.10 m nh4cl and 1 m nh3. buffer 2: a solution containing 1 m nh4cl and 0.10 m nh3

Which three statements represent the benefits of performing experiments using computer simulations?