Why do animals need a digestive system?

Answer 1

Plants are producers. They obtain their nourishment from photosynthesis. They do not need to digest food. There are some exceptions to this: The plant pipe and mistletoe live as parasites. Carnivorous plants utilize animals to provide nitrogen. They receive no energy from their prey.

Answer 2

Green plants produce their own food through a process called photosynthesis. The plant absorbs sunlight and produces sugars to feed itself. Humans and animals have to break down elements and compounds from their food.

Some plants (and plant-like fungi) break down dead material to absorb nutrients. The "carnivorous" plants such as the Venus Flytrap also have enzymes to "digest" insects, to provide minerals not available from the local soil.

Answer 3

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.

Answer 4

Every animal does not need a digestive system. The adult mayfly does not have one because it can live long enough to breed, living on stored food. Tape worms do not have their own digestive system. They release chemicals into the host's intestine that prevents nutrients from being absorbed. The tapeworm absorbs those nutrients through its cuticle. Most animals need a digestive system so they can obtain nourishment from food.

Answer 5

because they prepare there food from photosynthesis.they are producers..........

Answer 6

Because they obtain nourishment from/by photosynthesis.

Answer 7

You seem to be somewhat confused. All living organisms require some form of digestive system. It is one of the definitions of life