[kayo_20211030]

> A simplistic answer is that evolution has made each cell the size best suited to its function.

Yeah. That's probably it. Really, it probably is the right answer.

[fluoridation]

That just kicks the can forward one step. What parameters control the optimal size of a given cell?

[teravor]

there is likely evolutionary pressure against large cell size (selfish genes; larger cell takes energy away from replication, provides more opportunity for infiltration by other genes, fewer gene backups in other cells, etc) while occupying a niche puts pressure to be a certain size. it lands somewhere in the middle.

[taneq]

Why are things the way they are? Because it works better. Simple, really. :D