Darwin judged the fitness of an individual by
Ability to defend itself
Strategy to obtain food
Number of offsprings
Dominance over other individuals
The precipitation method of blood tests for finding out the inter-relationship among different animals was given by
How has the free ${O_2}$ been released into the earth's atmosphere whereas there was no free ${O_2}$ at the time of origin of life
Which of the following is true for 'Homo sapiens'
Which one of the following pairs of items correctly belongs to the category of organs mentioned against it?