Cannot be gained or lost during a reaction, only transformed.

a. air
b. matter
c. electricity
d. reactants

9. wind power creates pollution. water air soil noise

What advantages does a pedigree have over a written passage?

Rarefaction is used for which of the following? a. creating a representative sample b. studying how disease impacts populations c. rediscovering species thought to be instinct d. determining which sea creatures live in an area