Under the circumstances of films, we are informed that humanity has confirmed the existence of alien life with engineers, and Xenos, but how common is actual life in the universe, considering we know humanity is all but colonizing space how often do they interact with life if at all, or are any interactions a first for most alien franchise properties, like do they cattle from alien worlds? surely some worlds with plants would have native lifeforms right? how alien is the idea of alien life in this universe of spacefaring humans?