Question

Select the option and fill up the blanks
Most organisms do not use free
Options are are oxygen nitrogen carbon dioxide argon

Answer 1

Answer:

Oxygen

Explanation:

Most organisms do not use free oxygen

Answer 2

Most organisms do not use free oxygen.

Explanation:

• The primitive reducing or eliminating atmosphere of earth was rich in water vapour, carbon monoxide, carbon dioxide and hydrogen.
• Absorption of infrared radiation by green house gases imparted high temperature to primitive earth.
• The high temperature, UV light and lightning helps in reaction between above-mentioned elements.
• Oxygen did not occur in the free state as the prevailing reduced substances quickly combined with it to form oxides.
• Abundant hydrogen combined with free oxygen, nitrogen and carbon to form water, ammonia, methane and cyanides.

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