Name: ___________________________________________________________________ Date: ______________________ Class: _________
THREE GENERATIONS OF STICK-WORMS
1. Population One: Three generations of stick-worms living in the grass environment.
*Survival Rate (percent) = number survived divided by initial number
GREEN
Initial
Generation 1
Generation 2
Generation 3
25
Survival
Rate
x ________
x ________
x ________
BEIGE
Survived
Offspring
Total
x4
x4
x4
Initial
25
Survival
Rate
x ________
x ________
x ________
Survived
Offspring
Total
x4
x4
x4
2. Graph Results
 Make line graphs to show the number of surviving stick-worms for each color over a period of
three generations in each environment.
 Use colored pencils or pens to represent each color of stick-worms. ☐Green
☐Beige
# of surviving stick worms
Title: Grass Environment Population
Generation
Question: How does the coloration of a stick worm affect its chance of surviving if their environment
experiences a drought?
3. Hypothesis:__________________________________________________________________________________________________
_________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________
THREE GENERATIONS OF STICK-WORMS
4. Population Two: Three generations of stick-worms living in the straw (drought) environment.
*Survival Rate (percent) = number survived divided by initial number
GREEN
Initial
Generation 1
Generation 2
Generation 3
25
Survival
Rate
x ________
x ________
x ________
BEIGE
Survived
Offspring
Total
x4
x4
x4
Initial
25
Survival
Rate
x ________
x ________
x ________
Survived
Offspring
Total
x4
x4
x4
5. Graph Results
 Make line graphs to show the number of surviving stick-worms for each color over a period of
three generations in each environment.
 Use colored pencils or pens to represent each color of stick-worms. ☐Green
☐Beige
# of surviving stick worms
Title: Straw Environment Population
Generation
6. Conclusion:__________________________________________________________________________________________________
_________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________
_________________________________________________________________________________________________________________