How are food webs on land and in the water similar and how are they different?

Land food chains, also known as terrestrial food chains, usually start with a plant as a producer. Water food chains, or aquatic food chains, can start with an aquatic plant as a producer, but there are also microscopic free-floating cells called phytoplankton that can use sunlight to make their own food as well.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.