Which one of the following scientist’s name is correctly matched with the theory put forth by him ?
De Vries $→$ Natural selection
Mendel $→$ Theory of Pangenesis
Weismann $→$ Theory of continuity ofgermplasm
Pasteur $→$ Inheritanceofacquired characters
The hypothesis that all photosynthetic organisms require a source of hydrogen was first proposed by
The epoch of human civilization is
Which primitive man used stones to produce fire
Replacement of original hard parts or even the soft tissues of the organisms by minerals is known as