The best description of natural selection is
The best description of natural selection is
- A
The survival of the fittest
- B
The struggle for existence
- C
The reproductive success of the members of a population best adapted to the environment
- D
A change in the proportion of variation within a population
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The greatest evolutionary change enabling the land vertebrates to be completely free from the water. Habitat was the development of
The greatest evolutionary change enabling the land vertebrates to be completely free from the water. Habitat was the development of
In lysogenic state viral $DNA$
In lysogenic state viral $DNA$
$A$ : Archaeopteryx had free caudal vertebrae and toothed beak with teeth like reptiles.
$R$ : It is missing link between reptiles and bird
$A$ : Archaeopteryx had free caudal vertebrae and toothed beak with teeth like reptiles.
$R$ : It is missing link between reptiles and bird
Photosynthetic bacteria evolved on earth about ....... million years ago
Photosynthetic bacteria evolved on earth about ....... million years ago
Assertion: We have lost all the direct evidence of origin of life.
Reason: The persons responsible for protecting evidences were not skilled.
Assertion: We have lost all the direct evidence of origin of life.
Reason: The persons responsible for protecting evidences were not skilled.
- [AIIMS 1998]