Where do those nasty red balls (eggs?) come from in Darwinia?

Two questions, really:

  • Does the game explain at some point where those red "eggs" come from?
  • Where does these red "eggs" come from?

Solution 1:

The eggs are being spit by the flower-like things. You can destroy the flowers.

Also, the big slow flying monsters ("Spore Generators") lay them.

Solution 2:

All the red stuff is either a virus, or something infected by it (in the case of red darwinians)

Here's an enemy guide I found