... How many hydrogen atoms are in a representa- tive particle of each substance?
b. H2C2O4
d. C4H10O
a. Al(OH)3
C (NH4)2HPO4

they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

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answer; capital earns interest; entrepreneurship receives a profit or incurs a loss;