The human digestive system is a complex series of organs and glands that processes food. In order to use the food we eat, our body has to break the food down into smaller molecules that it can process; it also has to excrete waste.Most of the digestive organs (like the stomach and intestines) are tube-like and contain the food as it makes its way through the body. The digestive system is essentially a long, twisting tube that runs from the mouth to the anus, plus a few other organs (like the liver and pancreas) that produce or store digestive chemicals.

1. Food Chains

2. Food Chain
 Order in which
animals eat plants
and other animals.
 Each part of a food
chain is a link
connected to other
links.

3. Herbivores
 Herbivores are
animals that
only eat plants.

4. Carnivores
 Carnivores are
animals that
eat meat.
 Carnivores will
also eat
animals that
eat plants.

5. Omnivores
 Omnivores will
eat both plants
and animals.
 Some animals
eat both plants
and meat.
 People are
omnivores

6. Insects eat plants
 Insects eat
plants.
 Fish, frogs, and
birds eat the
insects that eat
the plants.
 This begins the
food chain.

7. Birds, Animals and
People Eat Fish
 Birds and other
animals eat the
fish. The fish eat
the plants and
insects.
 People eat fish
too.

8. A Food Chain
Bear
Insects Frog
Plant
Fish
People