Presence of $NaCl$ in body fluid indicates that life originated in
Primitive ocean
Rain water lakes
Salt solution
All of these
Which of the following is not a living fossil?
Which of the following relates to the determination of age of the tree by counting the number of annual rings
The fossils of Cro-Magnon were found in
The greatest evolutionary change enabling the land vertebrates to be completely free from water, was the development of
The rate of appearance of new life forms is linked to their