Food Web

The main source of energy for life on Earth comes from the Sun.

When being eaten, the energy is passed from one organism to another.

Organisms that use the Sun for producing food are called food producers.

Organisms that get energy by eating other organisms are called food consumers.

Food consumers must eat food producers or other food consumers to obtain their energy indirectly from the Sun.

Primary consumers are animals that feed on plants (herbivores).

Secondary consumers are animals that feed on other organisms (carnivores and omnivores).

The waste and dead animals are broken into smaller pieces by detrivores ( earthworms, millipedes, ants , etc)

Decomposers, bacteria and fungi, will break the waste into simpler substances.

When the number of prey increased, the predators will also increase because there is plentiful of food.

When the number of predator, the number of prey will decrease because they are being eaten up.

The factors that can cause the population to increase are:

· Birth

· Plentiful of food – more animals move into the habitat

The factors that can cause the population to decrease are:

· Death – due to illness, and increase in the number of predators

· Lack of food – animals move to other habitat.