Board Thread:Warhammer 40k General Discussion/@comment-24383134-20140117210424/@comment-6078851-20140122023724

tyranids have an organism for everything, and if they don't it wouldn't take the hive mind long to russle up an oceanic critter.

as for earths 'termination date', it would depend heavily on where the spore landed: there's a lot of empty space in the u.s - empty of people but plenty of bio-mas - if it landed in isolation that would be bad as they could multiply unchecked for quite some time and earth would be done in weeks, maybe 6 at the most. if it landed somewhere with a significant military presence then that would be a completley different scenario - people, vehicles and munitions would be mobilised to thwart the menace and earth could last up to maybe 5 or 6 days more ;P