Which Human type was the first to use stone weapons ?

Who were first to use tobacco?

Term nitche was first used by

Which type of thermosetting plastic is used to make switches, which is poor conductor of heat and electricity?

What is karyotyping? Who studied human karyotype for the first time? Define idiogram.

Term antibiotic was first used by:

Which part of the human body should one use to demonstrate stages in mitosis?

Who was the first scientist which used symbols for elements ?