No problem so Chain 1. Sun -> Tomato plant -> Tomato -> You The sun provides energy to the tomato plant which is used to grow a tomato which is eaten by you. Chain 2. Sun -> Wheat -> Flour -> Bun -> You The wheat uses the sun's energy to grow when the wheat is mature it is used to produce flour which is used to bake the buns for the hamburger which is then eaten by you again. Chain 3. Sun -> Lettuce -> You The lettuce grows and uses the sun's energy to live it is then eaten by you in the hamburger. Hope this helps :).
