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.
The study of homologous structures in mature organisms provides evidence for the evolutionary relationships among certain groups of organisms. Which field of study includes this evidence of evolution ?
Which of the following is not vestigial in human
In human beings, vestigial organs are
Development of patagia in animals is an
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