The presence of salts ($NaCl$ and others) in animal body fluid gives an inference that life originated in the
Salt solutions
Rain water
Primitive ocean
None of the above
Most primitive living mammals which provide an evidence of organic evolution from geographical distribution are found in
Theory of natural selection was proposed by
The hypothesis that all photosynthetic organisms require a source of hydrogen was first proposed by
Which one of the following experiments suggests that simplest living organisms could not have originated spointaneously from non-living matter