Adaptation of a species is its

What does artificial selection in high-milk-yielding cows indicate?

Which of the following revolutionary concepts in biology is associated with Charles Darwin's 'The Origin of Species'?

Natural selection can lead to . . . . . . .
$(a)$ stabilisation
$(b)$ genetic drift
$(c)$ directional change
$(d)$ disruption
Choose the correct answer from the options given below:
$(A)$ $(a)$, $(b)$ and $(c)$ only
$(B)$ $(a)$, $(c)$ and $(d)$ only
$(C)$ $(a)$, $(b)$, $(c)$ and $(d)$
$(D)$ $(a)$ and $(c)$ only

State Darwin's view on the role of variations in evolution.

The replica plating experiment was performed to prove which of the following concepts?