Source of oxygen to the atmosphere is photosynthetic organisms. Photosynthetic organisms, by performing photosynthesis, release oxygen into the atmosphere. So, oxygen in the atmosphere has been formed by Photosynthetic organisms. eg: Green plants, algae, cyanobacteria.

So, the correct option is ‘Photosynthesis of plants ’.

The very first atmosphere of earth was composed mostly of hydrogen atoms and was lost to space because hydrogen is very light gas. The second atmosphere of earth was contributed by gases from earth ’s rocky matrix and bombardment of  meteorites, it was composed of hydrogen, nitrogen, carbon and water. Hydrogen was the most abundant gas. 

Louis Pasteur in his swan neck flask experiment, found out that life originated from pre-existing life.

• He prepared sterilized syrup of sugar and later killed yeast by boiling them in flasks.

• Theory of special creation said that life has not changed a bit since its origin.
• Our solar system was formed from Big bang and not from a massive body.
• The remaining options are the connotations of theory of special creation.

Formation of Amino Acids by Electric Discharge
Amino acids are organic compounds that are the building blocks of proteins. They contain an amino group (-NH2) and a carboxyl group (-COOH) along with a side chain that differentiates each amino acid. The Miller-Urey experiment, conducted in 1953 by chemists Stanley Miller and Harold Urey, aimed to simulate the conditions of early Earth and investigate the possibility of the spontaneous formation of organic compounds, including amino acids.
The Miller-Urey Experiment:
1. The experiment involved creating an environment similar to the early Earth's atmosphere. Miller and Urey used a closed system consisting of a flask filled with a mixture of gases, including hydrogen (H2), ammonia (NH3), and water vapor (H2O), representing the reducing atmosphere thought to exist at that time.
2. This mixture was heated, and electric sparks were discharged through it to simulate lightning strikes, which were frequent during that period.
3. After a week of continuous operation, the mixture was analyzed, and it was found that several organic compounds, including amino acids, had formed.
Significance of the Experiment:
1. The Miller-Urey experiment provided evidence that the conditions on early Earth were conducive to the formation of organic compounds necessary for life.
2. The formation of amino acids in the experiment suggested that the building blocks of proteins could have been synthesized spontaneously on early Earth.
3. This experiment supported the hypothesis that life on Earth may have originated from simple organic molecules.
Answer:
According to the given information, Miller successfully demonstrated the formation of amino acids by electric discharge in a mixture of hydrogen, ammonia, and water vapor. Therefore, the correct answer is option C: Methane.
Note: The options provided in the question (Ether, Ethane, Methane, Carbon dioxide) are not directly related to the Miller-Urey experiment or the formation of amino acids.

• Charles Darwin had set voyage around the world in a ship named H.M.S Beagle.
• He traveled to different islands to research about evolution.
• He found out that the existing living organisms had many similarities with life forms that existed millions of years ago.

• Evolution is a stochastic process, which means that it is focusing on chance mutations.
• Based on determinism, evolution is not a direct process.
• It is also based on events that occurs in a chance.

Amino acid protiens etc are the precursor of life so we can say life starts with this.

Oxidising atmosphere is the region that life cannot originate from inorganic materials at present. Today 's atmosphere is not conducive to the spontaneous synthesis of complex molecules because the oxygen attacks chemical bonds, extracting electrons. Hence, the correct option is b.

Bacteria is first inhabited in earth and so bacteria is heterotroph option C is correct.