Organisms in an
Ecosystem

Habitat: the place where an
organism lives out its life.
1. it can change
2. or disappear
3. it is the location of food,
shelter, and other essential
resources.
Niche

The role and position a species
has in its environment-how it
meets its needs for food and
shelter, how it survives, and how
it reproduces.
Examples



Polar bears in the polar
regions-fur coat
It’s an advantage for a
species to occupy a
niche different from
those of other species.
Always try to reduce
competition.
Living Relationships: either
beneficial or harmful
Predator-Prey

Such as the lion and wildebeests.
The predator KILLS and eats the
animals, and the PREY is being
eaten. This relationship causes
fights for survival.
Symbiosis
(3 types)

Means living together; a close and
permanent association among
organisms of different species.
Commensalisms



1 species benefits
and the other is
neither harmed nor
benefited.
Ex. Dog-Human
Ex. Falcon-Geese
Mutualism

When two species benefit from
living in a close association.
Ex. Rhino-birds
 Ex. Ants-trees

Parasitism

One organism benefits at the
expense of the other.

Ex. Ticks, tape worm, round
worm