One of the following appeared on the earth with the coming of the plants and was absent in the past
Carbon dioxide
Methane
Ammonia
Oxygen
Early earth had reducing atmosphere.
All of the following are the mammals wholly living in water except
$A$ : Archaeopteryx had free caudal vertebrae and toothed beak with teeth like reptiles. $R$ : It is missing link between reptiles and bird
Goldschmidt has classified evolution into micro, macro, and mega evolution. Which one of the following is referred to as micro-evolution
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