Origin of different types of beaks occur due to

  • A

    Natural selection

  • B

    Interspecific competition

  • C

    Genetic drift

  • D

    Interspecific variation

Similar Questions

When we say ''survival of the fittest'', does it mean that $(a)$ those which are fit only survive, or $(b)$ those that survive are called fit ? Comment.

How Biological evolution has taken place ?
 

Theory of natural selection was given by

Explain theory of inheritance of acquired characters with proper example.
 

Lamarckian theory deals with