MCQ
The wrongly matched pair w.r.t. the organisms and their probable time of evolution is
- AJawless fish -around $350$ mya
- BLobefins -around $350$ mya
- ✓Fish-like giant reptiles -around $320$ mya
- DSea weeds -around $320$ mya
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$1.$ primary treatment of sewage
$2.$ secondary treatment of sewage
$3.$ anaerobic sludge digester
$4.$ production of bioactive molecules