look at the tails. if it is long it is a female. if it is not it is a male.
Look at the antenna on the head. If it's a male it will have large well developed antenna with lots of hairs on them to catch a whiff of the female pheromone. The female antenna would be plain whip...
They can but some can't because some could only see in the night but some can only see when there is sun.
A male moth can smell a female moth from 100 yards away.
a male rest with its wings up.a female rest with its wings flat.