Think about it
1. Living organisms are composed mostly of four elements: ______________ , _______________, ____________, and _______________ .
Recycling in the Biosphere
2. Unlike the _____ -way flow of energy, matter is ____________ within and between ___________ .
3. What are biogeochemical cycles?
4. What three processes are involved in the cycling of matter?
A.
B.
C.