1. Food Chains
FOOD CHAINS FOLLOW A SINGLE PATH
AS ANIMALS EAT EACH OTHER.
A food chain shows how living things get food and
energy. The energy source for almost all food chains is
the sun. The first organism in a food chain is a producer.
In a meadow, grass is a producer. Crickets eat the grass,
snakes eat the crickets, and the hawks eat the snakes.
When plants and animals die, they are broken down
by decomposers. The nutrients return to the soil and can
be used by the producers.

2. Food Webs
FOOD WEBS SHOW HOW PLANTS & ANIMALS
ARE INTERCONNECTED BY DIFFERENT
.PATHS
FOOD WEBS show how plants and animals
are connected in many ways to help them all
survive. FOOD CHAINS follow just one path
.of energy as animals find food
Often ecosystems have many food chains. Grass and
mice live in a meadow, but so do birds, insects, and many
other organisms. All the food chains in an ecosystem
connect to form a food web.
The difference between a food chain and a food web is
that a food chain only follows one path as animals find
food. A food web is several food chains joined together.
A hawk might eat a mouse, a squirrel, a frog, or another
animal. A snake may eat a beetle, mouse, or another
animal. Every other animal may eat many different types
of animals in a food chain.

4. Done
Student
Mohamed Eldesoki Shalabi
Chemistry & zoology department
Faculty of science
Mansoura University
Instructor
Dr. Abeer Elsaaed