എങ്ങനെയാണു എളുപ്പത്തിൽ വംശനാശം സംഭവിക്കുന്നത് ?
Aവനനശീകരണം
Bകനത്ത മഴ
Cനഗരവൽക്കരണം
Dകുന്നുകളുടെ സ്ലൈഡിംഗ്
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