Answers

2015-11-29T21:32:31+08:00
This layer of earth is called Crust...
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2015-11-29T22:54:35+08:00
There are 3 layers of Earth, namely, the crust (continental and oceanic), mantle, and core (inner and outer).

And most organisms exist at the crust.
 
---Kein09---
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