Obviously the subject of Biology was absent from my studies, lo, those many years ago. Otherwise,

it would not be news to me -- which it is, from looking up solitary bees --
that all bees evolved from, of all things, the wasp.

That is a sobering consideration.
Wasps are carnivorous and predatory.
Bees -- even the stinging, swarming, defensive ones --
prefer to get their nourishment from
the (once abundant) forms of plant life.

Maybe humans could learn from their example.