Download WS 2 - natural selection

Science 9
Unit 2
Section 1.3
Name:
Date:
Worksheet # 2 : Natural Selection
1.
Define Natural Selection (in your OWN words).
2.
Use the example of anti-biotic resistant bacteria to explain the theory of natural selection.
You may do this in words or with diagrams.
3.
Using the theory of natural selection, explain why giraffes have very long necks.
4.
What is variability?
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5.
Describe several examples of changes in the environment that might select some individuals in
a species for survival over other individuals. Explain two of your examples.
6.
Provide one example where variability within a species has helped a species survive an
environmental change.
7.
Suppose a population of sparrows migrating south for the winter is blown off course by a storm
and the sparrows become isolated on an island. The only food source on the island is a plant
that produces large seeds.
Which birds in the population, those with large beaks or those with small beaks, will survive to
continue their migration or to populate the island? Explain your answer.
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