Describe the strategy you used in the game to grow your trees. How did other players' tree placement affect your ability to get sunlight? What happened when a tree was in the shadow of another tree?

Save guides, add subjects and pick up where you left off with your BBC account. Photosynthesis is the process by which green plants use sunlight energy to make their own food. Check your knowledge ...

Experience the events of the first day of the Gallipoli Campaign in this App especially designed for tablet devices ...