Branching descent is one of the key concepts of
Lamarckian theory
Miller’s theory
The Big Bang theory
Darwinian theory
$I.$ Use and disuse of organs
$II.$ Inheritance of acquired characters
$III.$ Branching descent
$IV.$ Natural selection
$V.$ Mutation
$VI.$ Reproductive isolation
The two key concepts of Darwinism from the given options are
Contribution of scientist :
$(a)$ Charles Darwin
$(b)$ Lamarck
Evolution means