Darwin’s Theory of Evolution through Natural Selection: FOUR FACTORS
VARIATION
OVERPRODUCTION
(Draw Different Beaks
successful in eating
different food.)
(Draw Sea turtles laying
120 eggs, few survive to
adulthood)
Differences between
individuals of the same
species
Species produce far more
offspring than can
possible survive.
COMPETITON
SELECTION
(draw two animals in
( draw an unborn fetus)
battle biting at each other)
Since food and resources
are limited, the offspring
must compete to survive.
Variations make certain
individuals better adapted
to their environment.
Those individuals are
more likely to survive and
reproduce.