Which of the Following Gases Was Not Present in the Earth's

question 72

Multiple Choice

Which of the following gases was not present in the Earth's early atmosphere but appeared after the evolution of certain organisms?

• A) hydrogen
• B) methane
• C) nitrogen
• D) oxygen
• E) carbon dioxide

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Definitions:

Copper

A chemical element with high electrical conductivity, widely used in electrical wiring and electronics.

Differential Compound

When the series and shunt field are connected in such a manner as to oppose each other in the production of magnetism.

Shunt Field

The winding of a generator or motor that is connected in parallel with the armature, used to regulate the machine's voltage or speed.

Armature

The rotating coil or core in a motor or generator, on which the voltage is induced by magnetic fields.