First mammals appeared around
$459\; million$ years back
$220\; million$ years back
$1600 \;million$ years back
$3800\; million$ years back
Mammals first appeared in triassic period of mesozoic era.
Which phenomena confined the pouched mammals of Australia survived because of lack of competition from any other mammals?
Golden age of reptiles is
Origin of mammal-like reptiles occurred in
The wrongly matched pair w.r.t. the organisms and their probable time of evolution is
The first cellular form of life could have originated
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