Which of the following is the correct sequence of events in the origin of life ?
$I.$ Formation of protobionts
$II.$ Synthesis of organic monomers
$III.$ Synthesis of organic polymers
$IV.$ Formation of $DNA$ based genetic systems
$I, II, III, IV$
$I, III, II, IV$
$II, III, I, IV$
$II, III, IV, I$
The presence of salts ($NaCl$ and others) in animal body fluid gives an inference that life originated in the
Anatomically and structurally different, but functionally similar structures are called
Biological species concept emphasizes on
According to spontaneous generation theory, the sequence of origin of life may be considered as
Which of the following is the vestigial organ in human beings?