Deathcare for Population

Eventually you start producing corpses in your colony proportional to your current population, representing deaths and replacements. People dying always leave corpses. Tie it to a realism setting if players don't want to the extra burden.

Corpses are collected in the morgue and can be disposed of by dumping, ceremonial burial, reprocessing, or "reprocessing".
Dumped corpses will decay into regular old dirt but produce a bit of pollution.
Ceremonial burial is taken care of in the cemetery. A cemetery will take care of corpses and, if provided with wood or other casket materials, will provide a bit of unity. Funerary plots open up for reuse after 80 years.

Corpses can be cremated in a crematorium for a cost of fuel gas/hydrogen to get exhaust and unity with much less space. They can also be fed to the digester, but you get no unity this way.

If people have starved to death in this colony then an option may appear in the food processor for, umm, processing. No unity for doing this tho.