Sunlight does not go very deep into water so seaweed must grow at the surface where its rays can reach them. Starting with the sun, food chains link together plants and animals in various ecosystems to help them survive. What are Food Chains and Webs? describes these connections in a clear manner that children will understand. Fascinating diagrams show - the connection between herbivores, carnivores, scavengers, decomposers, and themselves - concepts such as energy pyramids, photosynthesis, and consumer hierarchies - an entertaining food web game