The document describes how the Peppered Moth evolved through natural selection. Before the Industrial Revolution, most Peppered Moths were light in color to camouflage themselves on light-colored trees. A small number were dark. During the Industrial Revolution, pollution from factories darkened tree bark. This caused dark Peppered Moths to better camouflage while light ones were more visible to birds. Over time, more dark moths survived to reproduce, causing that variety to become more common through natural selection based on environmental changes.

1. An Example of Evolution
The Peppered Moth

2. What is the Peppered Moth?
• In ____________ there lives a moth called
the Peppered Moth.
• It is called the Peppered Moth because it
is mainly white with __________ of black
on it.

3. The Peppered Moth
• In England, the Industrial Revolution
began in ________.
• Before ________ the Peppered Moth
looked like this:

4. The Peppered Moth
• Before 1750, the Peppered Moth blended
in with the trees it liked to live on.
• It was ___________________.
Tree

5. A Variety of the Peppered Moth
• Before 1750 there also lived a kind of
Peppered Moth that was almost entirely
___________. It did not blend in with the
trees it lived on.
Tree

6. Variety
• Even though there were two different
___________ of Peppered Moths, they
were both called Peppered Moths.
• Just like some humans have light skin and
some humans have dark skin. All
varieties are called ___________.

7. A Question for You
• Which variety of Peppered Moth was
easier to spot by birds who love to eat
moths?

8. What Does That Mean?
• Because the _______ variety is easier to
spot, _______ of them were around before
1750 than the light variety.

9. What Does That Mean?
• ________ of the light variety were able to
reproduce.
• ________ of the dark variety were able to
reproduce.
• The dark variety was headed towards
________________, where no more would be
around ever again.
• This is called ________________________ or
Survival of the Fittest.

10. Natural Selection
• Since the dark one’s are not as _______
to survive, they will not survive much
longer. That’s why Natural Selection is
called Survival of the Fittest.

11. The Industrial Revolution
• With the coming of the Industrial
Revolution, things were about to
____________ for the Peppered Moth.
• The Industrial Revolution created factories
with chimneys that pumped out dark
smoke called _________.
• The soot covered everything: buildings,
roads, and _________.

12. The Trees Changed colors
• Gradually, as the Industrial Revolution
kept increasing, more and more soot
covered everything.
• The bark on trees became darker and
darker until they were almost _________.

13. The Trees Changed Colors
Trees _________ the
Industrial Revolution
Trees _________ the
Industrial Revolution

14. A Question for You
• Now after the Industrial Revolution, which
variety of Peppered Moth was easier to
spot by birds who love to eat moths?

15. What Does That Mean?
• Because the ___________ variety is
easier to spot, less of them were around
after 1750 than the dark variety.

16. What Does That Mean?
• Now, more of the dark variety were able to
______________.
• Less of the light variety were able to
reproduce.
• The light variety was now headed towards
________________, where no more
would be around ever again.

17. What Does All of this Mean?
• The Peppered Moth used to be mainly
___________ colored.
• But because of the Industrial Revolution,
the _____________ variety (the dark
variety) has now become better able to
survive.
• This type of animal has ______________
because of the change in its environment.