Decomposers
1. Sun
2. Producers
3. Herbivores
4. Carnivores
5. Scavengers
consumers
Omnivores
PLANTS
All the oak trees in a forest
~ An orchid living on
a tree branch
~A tick feeding on an bird
Food web
an ecosystem

contains only a biotic environment.
Living Things:
tree
squirrel
Fish
bird

consumer
scavengers
a biome can contain
one or more ecosystems.





1. A rainbow trout
2. All the rainbow trout in a stream
3. The water, rocks, and organisms in a
stream
4. All the rainbow trout, other fish, and
insects in the stream
People in a community cut
down trees in a forest so
they could use the wood.
They cut down many trees
each year.
After several years, a
population of rabbits in a
nearby field had become so
large that the rabbits were
causing problems for the
community.
What is the explanation?
Energy Pyramid for the Food Web
Fish
gull,
lobster
Prawn, crabs,
whelk,
Who are the producers?
Seaweed and phytoplankton
What are the herbivores?
mussels
Limpets and zoo
plankton
Limpets and zoo plankton
Seaweed & phytoplankton