Which one of the following gas was not present in free form at the time life originated on earth?
Ammonia
Oxygen
Hydrogen
Methane
Primitive earth was reducing type. It had no oxygen.
'Population tends to increase geometrically, while food supply increases arithmatically'. This concept was put forward by
Study of origin and development of humans in all their physical, social and cultural relationship is called
Organic compounds first evolved in earth required for origin of life were
The theory that evolutionary change is slow and continuous this phenomenon is known as
An evolutionary trend in which there is general degeneration and loss of organs is
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