Origin of different types of beaks occur due to
Natural selection
Interspecific competition
Genetic drift
Interspecific variation
Describe theory of natural selection ? Who gave this theory ?
What are the key concepts in the evolution theory of Darwin ?
The scientists believe that evolution is gradual. But extinction, part of evolutionary story, are 'sudden' and 'abrupt' and also group-specific. Comment whether a natural disaster can be the cause for extinction of species.
Lamarck's theory of evolution is also called