Explain how the behavior of solitary bees and social bees increases their chances of reproductive success.

Working alone, the female collects building materials for the nests and food for the larvae, then builds an individual cell for each egg. She lays each of her 20-30 eggs on top of a ball of pollen stuck together with nectar. She builds a partition wall, then repeats the process until the tube or hole is full.

Explanation:

"a.) well–developed vascular system."