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2.3 Adapting to the
Environment
Mrs. Trimble
Mrs. Perryman
Adaptations


Organisms “want” to be
well suited to their
environment.
Kangaroo Rat
Adaptations
Habitat
 Mohave Desert
 Extreme Heat during the
day
 Extreme cold at night
 Little Water
 Plants adapted with small
seeds
Adaptations-Structures
and behaviors
Living in Burrows
 Cheek pouches open to
their shoulders for more
storage.
 Foot Stomping
 Kicking sand
 specialized kidney’s that
allow them to conserve
water.
Adaptations

An inherited trait that
increases the
chances that an
individual organism
can survive IN THAT
HABITAT
 What are some of the
adaptations of the
polar bear?
 Will they survive?
Natural Selection

Unequal survival and
reproduction that
results from the
presence or absence
of particular traits.
Kangaroo Rat vs Urban Rat
Five Points of Evolution by





All organisms have the ability to produce more
offspring then can survive.
The environment contains “things” that kill
organisms.
Individuals in a population vary genetically, or
differ, in their traits.
Some inherited traits give individuals an
advantage in coping with environmental
change.
Individuals with advantageous traits tend to
survive and reproduce more offspring.
Evolution

A change in the
genetic
characteristics of a
population from one
generation to the
next.
 Peppered Moth
Co-Evolution

When two or more
species evolve in
response to each
other
Ant and Acacia
Pollinators
Extinction

The irreversible loss
of a species
Extirpated

An organism that was
once found in a
region, is no longer
found in that location,
but still exists.
 In Illinois the Wolf is
considered extirpated
(although there have
been some unconfirmed
sightings in Southern and
Central Illinois)