I'm going straight to the point, so how about we try to come with how the Helghast evolved while on Helghan and what they did. We already know about the fact that many died from lung burn and there were famines along with blockades from the UCN. However, why did they evolve the way they did, and is it actually realistic? We already know the pressures the environment brought upon the people, but how did they adapt. For instance, isn't it that they became stronger in muscular strength along with hairloss a sign that simply their testosterone levels got higher? Or, how about why they became so pale, was it their diet had absolutely little vitamin D? Well, the thing I have on my mind is how did they get such a high population on a deadly planet in only 150 years? Well, is anyone willing to discuss about this?