Not a single alien lifeform, not even a blob.

Fifty years earlier, a gigantic alien lifeform dubbed Wormwood crashed into London and sank into the ground.

Bite from a Brakkanee, you could have contracted Alien Lifeform Injected Cerebral Encephalopathy.'

Those tricks expand the phase space of potential alien lifeforms in ways that are totally unimaginable.

Would we expect this in alien lifeforms too, or is it a peculiarity of our almost-panterrestrial DNA-recombinational system?

Will alien lifeforms, then, have two (or more) sexual forms, bisexuals, hermaphrodites, or systems not seen here at all?

While this would be an interesting branch of psychological pathology, it throws no light whatsoever on what real alien lifeforms are like.

"Story of Your Life," which provides the basis for the film Arrival, concerns the presence of alien lifeforms on Planet Earth.