What do hummingbirds and hawks represent?

$I.$ 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

While creation and presence of variation is directionless,natural selection is directional as it is in the context of adaptation. Comment.

What is a significant consequence of geographical isolation?

To be evolutionarily successful,a mutation must occur in the

Assertion : Natural selection is the outcome of difference in survival and reproduction among individuals that show variation in one or more traits.
Reason : Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear.