The addition of oxygen to the atmosphere by cyanobacteria started oxidising and , which began to disappear.

methane, ammonia

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ozone, propane

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water and nitrogen dioxide

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helium and silica

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Solution

The correct option is A methane, ammonia
During the time oxygen releasing photosynthetic organisms developed, they were similar to the existing blue green algae(cyanobacteria). They used water to get hydrogen and released oxygen. Addition of oxygen to the atmosphere started oxidising the methane and ammonia, which began to disappear.
${CH}_{4} + 2 O_{2} \to {CO}_{2} + 2 H_{2} O 4 {NH}_{3} + 3 O_{2} \to 2 N_{2} + 6 H_{2} O$

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The addition of oxygen to the atmosphere by cyanobacteria started oxidising ________ and ________, which began to disappear.

The addition of oxygen to the atmosphere by cyanobacteria started oxidising and , which began to disappear.