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Scan the titles, boldfaced words, pictures, figures, and captions
in Section 3. Write two facts you discovered about animals as you
scanned the section.
1.
2.
Use your book or dictionar y to define cycle. Then give an example
of a cycle.
Use your book or dictionary to define each vocabular y term.
Principles of Ecology
Section 2.3 Cycling of Matter
18 Principles of Ecology
Main Idea
New
Vocabulary
cycle
biogeochemical cycle
denitrification
matter
nitrogen fixation
nutrient
Review
Vocabulary