1.
Scientists believe that people long ago needed food, so
they followed herds of mammoths to North America.
_____effect______________
2. People long ago used weapons
because they needed to find
food. ___cause__________________
3. Because they
wanted to learn about life long ago,
archaeologists studied artifacts. ____cause_____________
4. Hunter-gatherers
learned to grow food, and as a result,
their lives became easier. _____cause______________
5. The glaciers began to melt
and therefore the land bridge
between Asia and North America became flooded.
____effect___________
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