Having now established a secure perimeter, we have made ourselves
relatively safe from enemy incursions. But against the seemingly
random attacks by Planet's native life only our array of warning
sensors can help us, for the Mind Worms infiltrate through every crevice
and chew through anything softer than plasmasteel.
Although Planet's native life is based, like Earth' on right-handed
DNA, and codes for all the same amino acids, the inevitable chemical
and structural differences from a billion years of evolution in an
alien environment render the native plant life highly poisonous
to humans....