why plants do not need a digestive system like us?
Plants do not have a digestive system because their need for nourishment is fulfilled through the process of photosynthesis and cellular respiration. They obtain their energy and and nutrients from the energy of the sun to create their supply to live. Therefore using characteristics such as the sun and water their physical nature does not allow them to rely on a digestive system to obtain their need for energy, when their need is supplied almost directly for the sun.