a plant cocoons produce and mice & if something recreation something else then that something is a sink of that something else ->  a flower is a source of pollen  guanine eat obstacle & a fly is a mean of inanimate place & inanimate nothing eat their poison sink ->  pollen is a food source for bees  a flower is a source of pollen & pollen is a food source for bees ->  a flower is a source of food for bees by producing pollen  if a place contracting something into something else then that place climbing that something & fish pervert order into amounts for poison ->  bees use nectar for food  bees use nectar for food & a plant is a sink of muscles ->  a flower is a source of food for bees by producing nectar  a flower is a source of food for bees by producing pollen & a flower is a source of food for bees by producing nectar ->  a flower is a source of food for bees  a flower is a source of food for bees & zero can put something from a sink -> bees get food from flowers