Which characteristic is responsible for the formation of a new 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

What is a significant consequence of geographical isolation?

Random genetic drift in a population probably results from

Which of the following can be used as an illustration to demonstrate the process of evolution in animals?

In a Mendelian population,genetic drift occurs in which of the following?