How does the reaction of hydrogen and oxygen to produce energy in a fuel cell differ from their interaction during the direct combustion of hydrogen and oxygen? 
I.The direct combustion of hydrogen and oxygen produces several different products,whereas the fuel cell produces only water
II) Much less heat energy is produced in a fuel cell than via direct combustion of hydrogen and oxygen
III) In the fuel cell,there is an oxidation-reduction reaction between hydrogen and oxygen.In the direct combustion of hydrogen and oxygen,there is no such reaction
IV) It is much easier to control the hydrogen and oxygen during direct combustion than during their reaction in a fuel cell
Definitions:
STI
Sexually Transmitted Infection; diseases that are primarily spread through sexual contact.
Chlamydia
A sexually transmitted infection caused by the bacterium Chlamydia trachomatis, often asymptomatic but can lead to serious reproductive and other health issues if untreated.
Exhibitionism
A psychological phenomenon characterized by a compulsion to display one's body parts to an unsuspecting audience.
Pedophilia
A psychiatric disorder characterized by an adult's sexual attraction towards prepubescent children.
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