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
Assertion : Jave Ape-man, Peking man and Heidelberg man are the fossils of Homo erectus.
Reason : Homo erectus evolved from Homo habilis.
Select the mismatched pair
Viroids have
Which represents a connecting link as an evidence in favour of organic evolution