Which elements do hydrogen fuel cells combine to produce electricity? A. hydrogen and oxygen
B. hydrogen and carbon
C. hydrogen, oxygen, and nitrogen
D. hydrogen, carbon, and nitrogen
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The use of logic making empirical observations and performing dissections were all part of the scientific studies by

Were does condensation occur? a) hydroshereb) lithosherec) boishered) atmosphere

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping