Board Thread:Warhammer 40k General Discussion/@comment-6589306-20130228113457/@comment-6078851-20140621134634

a) i don't know how strong tyranid acid-blood can get but xenomorph blood is equivilant to concentrated molocular acid. as far as i know acid can't get stronger than that, so i'd say, at the very best, tyranid acid-blood can only equal the acidity of xeno blood.

b) i know a fair bit about tyranids but actually very little about their growth rates. i'm not sure who has the greatest rate of growth but given the sheer scale of the tyranid race (the biggest xeno is the superqueen, which is a speck compared to the biggest tyranid) it's probable that tyranids would win this one.

c) tyranids, easily.

but since i now have a theory of xeno's being what tyranids have evolved from then my answers are technically - a) both, b) both, and c) both :P