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Read the following sentences.  Decide if the words in bold are the cause or the effect.  Write cause or effect on the line.  Then underline the "signal" word or phrase.


1. Scientists believe that people long ago needed food, so
   they followed herds of mammoths to North America.

2. People long ago used weapons because they needed to find

3. Because they wanted to learn about life long ago,
   archaeologists studied artifacts. ________________

4.  Hunter-gatherers learned to grow food, and as a result, 
    their lives became easier.  _________________

5. The glaciers began to melt and therefore the land bridge
   between Asia and North America became flooded. 


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