In the 18th century people began to accept
that two organisms evolve into one.
In 1859 Darwin Published a book
Genetic Variation
Characteristics of individuals vary due to differences in genes
Environmental change
Conditions
in an area
change, lack
of resources
(food)
causes more
competition
between
organisms.
Natural Selection
By chance, the variation of some
individuals make them better at
coping than others
'Survival of the fittest'
Inheritance
Survivors breed and pass on their variations, to their
offspring, so the next generation contains more individuals
with better adapted variations
Evolution
If enviornmental conditions
remain changed, natural
selection occurs over and
over again, and a new specie
evolves with all the
individuals having the better
adapted variations