 Given Sil grows rapidly and kills humans with ease , at a certain point film character Dr. Laura Baker even speculates if she was a biological weapon sent by a species who thought humans were like an <unk> weed . Feldman declared that he wanted to explore this theme further in the script , as it discussed mankind 's place in the universe and how other civilizations would perceive and relate to humanity , considering that " maybe [ humans are ] not a potential threat , maybe a competitor , maybe a resource . " He also declared that more could be said about Sil 's <unk> doubts , as she does not know her origin or purpose , and only follows her instinct to mate and <unk> the species . 
