
There are two major varieties of
peppered moths, a light-colored variety
and a dark-colored variety. These
moths are active at night and rest on
trees during the day.

1. Does the environment effect which
kind of peppered moth is more
abundant?
There are actually two in this picture!

1. Does the environment determine
which moth is more abundant?
2. Why does this
environment favor
the white moth?

The following is fictional data collected
over a ten year span by scientists.
Moth type
Year
1
Light
colored
moths
663 602 565 490 444 389 297 178 99 46
Dark
colored
moths
Year
2
Year
3
Year
4
Year
5
Year
6
Year
7
Year
8
Year
9
Year
10
72 147 211 298 376 423 499 558 641 714
3. What conclusions could we make using this
data?
800
600
400
Light
Dark
200
0
Light
Charts and Graphs!
10
9
8
7
6
Light
5
Dark
4
3
2
1
0
200
400
600
800
1000
Answer: A line graph.
800
700
600
500
Light
400
Dark
300
200
100
0
1
2
3
4
5
6
7
8
9
10
6. What environmental factor determined
which moth was more abundant?
 7. What things could change this
environmental factor?
 8. Does this change cause a change in the
species?

 9.
Is that evolution?