Question

Abiogenesis is:
A. Origin of life from non-living organisms
B. Origin of microbes from living organisms
C. Spontaneous generation
D. Origin of microbes and viruses

Answer 1

Hint: Life began on earth more than 3 billion years ago, from a tiny microorganism to a complex organism. There are many theories put forth by many scientists as to how life originated on earth. Many of them believe that the earth was in a primordial state and to prove this Miller and Urey demonstrated the experiment.

Complete answer:Origin of life from non-living organisms- This is also called an Abiogenesis theory in which the origin of life was from non-living organisms. In this theory, the organic molecules were created by forces like thunderstorms other than living organisms. And this was proved by the famous Miller and Urey experiment which proved the theory of Abiogenesis.
Origin of life from living organisms- This theory states that the microbes originated from other existing living organisms.
Spontaneous generation- This is a theory that states that living creatures will arise from nonliving things. In this hypothesis, a certain form of life such as fleas would arise from matter such as dust, or maggots will arise from stale meat, etc,
Origin of microbes and viruses- Microbes and viruses are like living specks of dust which could have even been when the earth was in a hot state. Thermophiles, Archaebacteria are proof that microorganisms can survive even in hot temperatures, with no oxygen, and even in acidic pH.
 Hence the option is A, Origin of life from non-living organisms.

Note:By the above statements, we can make it clear that life originated through abiogenesis because there was strong proof that was shown by the Miller and Urey experiment.
In 1953, Miller and Harold Urey demonstrated an experiment to test Oparin and Haldane's theory. During this experiment, they found that the organic molecules will be spontaneously produced under reducing conditions that resembled the earth's conditions.