Someone needs to write a book similar to the Origin Of the Species BUT address the evolution of co mingling synergistic life forms through time.

Different species that rely on each other to survive is a fascinating subject of mutually beneficial give and take. A lesson more valuable than survival of the fittest in my opinion.

The book could start with the internalization of the mighty microbial Mitochondria into ever larger and more comples living cells until eventually they are encoded into the organism's DNA itself. (I may be looking at this process from the wrong side of the looking glass but it is a good place to start none the less)

The Ant colony is an excellent example of co operation and animal husbandry and agriculture with the deliberate growing of edible fungus and milking of aphids for their sweet happy juice.

A stark contrast will occur when we finally reach modern man...

All parasite and no synergy makes Earth a bad place to live.