My topic during my Class Demonstration in History and Philosophy of Science course.

2. Let us Pray…

3. What is Evolution?
Is a slow
process of change
by which organisms
have acquired their
distinguishing
characteristics; it
has been going on
since the Earth was
formed billions of

4. “Evolve” Means to Change Over
Time
• The notion that
life on Earth
has changed
over time is
quite old
• To be
considered
science, this
notion requires

5. Is evolution a fact or a theory?
We could say that it is both.
It is a fact, for example,
that living organisms have
changed over time. These
changes, which include the
evolution of major groups of
plants and animals, are
documented in fossil records
and were recognized by the

6. Charles Darwin’s
On The Origin of
Species provided a
convincing theory as to
how these changes
occurred. In this
respect, evolution is
indeed a theory, a
collection of carefully
reasoned and tested
hypothesis about how
evolutionary change

7. How about Natural Selection?
The theory that
states
that those organisms
best adapted to their
environment have
a better chance of
surviving and
reproducing.

8. Okay!!! Let’s have a Sojourn to
Galapagos Islands with Darwin…
Hooray!!!

9. THEORY OF
NATURAL
SELECTION
Charles Robert
Darwin (1809 - 1882)
proposed and formulated
the process of evolution
in his book, On The Origin
of Species by Means of
Natural Selection
published in 1859 after
taking trip around the

10. His theories
stated that common
descent does occur and
that natural selection
results in adaptation to
the environment.
Natural
Selection is the
mechanism he proposed
for how adaptation comes
about.
It is caused by
environmental selection of

11. The Voyage of the Beagle: Ports
of Call
Noted that
populations of
organisms
were slightly
different from
place to place
Each group
was modified
to their
specific
environment

12. The Galapagos
Archipelago

13. What did Darwin find at the Beagle?
The finches on each island in the Galapagos
had different types of beaks.

15. What did Darwin find at the Beagle?
The tortoises on each island in the Galapagos
had different types of shells.

16. With those
observations
Darwin found out
that:
1.Organisms had a
common ancestor,
but had adapted to
their particular
environments and
changed over time.
2. Darwin published
his

17. Natural Selection
• For natural selection to occur,
there must be at least two
varieties of a species.
• For example: the peppered moth

18. Peppered Moths
• At the beginning of the Industrial
Revolution in England, coal
burning produced soot that
covered the countryside in many
areas

19. What do you think
happened?

20. Evolution/Natural Selection
• White moths became
easier to see, while
the black moths
became harder to
see. The black moths
were more likely to
survive and pass on
the gene for dark
color to their
offspring.
• Over time, the black

21. Development of Evolutionary
Theory
Darwin Concluded:
• Physical traits and behaviors enable
organisms to survive and reproduce
(called Fitness )
• Fitness results from adaptations
–Structural (body structures)
–Behavioral (protection, predation,
mating)
–Functional (chemicals produced by

22. Let’s have a Review with Haik!!!

23. Group Activity
Directions:
Divide the class into two. Each
group will formulate a summary of
Darwin’s Natural Selection in a form of
news story and present it to the class
thru News Casting, Each group will
select at least 2 reporters to do the
news casting.

24. WILDCATS
NEWS
HEADLINES Charles Darwin’s Natural Selection!