All of the above
Nectar and pollen
An egg
A waxy coating along the inside
Be patient and observe them
Look for them places with many flowers
Do not be afraid of them
They smell them
They dig at random until they find one
They hear them
They memorized a map
Most of the native bees in North America have already been studied.
400
1000
4000
10
To hide from birds that would eat them
To make a nest for their young
To find food underground
To make a burrow to keep themselves cool in the summer
Even native bees that can sting rarely sting people unless you scare or hurt them.
To find females to mate with
In underground cells
In honeycombs
In the bark of trees
On flowers