Question

The main explanation for the lack of a continuing abiotic origin of life on the Earth today is that ______.

Options

• there is not sufficient lightning to provide an energy source.

• our oxidising atmosphere is not conducive to the spontaneous formation of complex molecules.

• there is much less visible light reaching Earth to serve as an energy source.

• there are no molten, surfaces on which weak solutions of organic molecules would polymerise.

Answer 1

The main explanation for the lack of a continuing abiotic origin of life on the Earth today is that our oxidising atmosphere is not conducive to the spontaneous formation of complex molecules.

Explanation:

The early Earth had a reducing atmosphere that favored the abiotic synthesis of organic molecules. However, Earth’s current atmosphere is oxidizing, rich in free oxygen, which destroys many intermediate organic molecules necessary for spontaneous abiotic synthesis. Additionally, the presence of existing living organisms means that life today arises from pre-existing life, not from spontaneous chemical processes. Thus, the oxidizing atmosphere prevents the continued abiotic origin of life on Earth today