The BVD stands for Back Vertex Distance, this is a measurement that is included on any prescription where the sphere or cylinder powers are higher than + or - 5.00D and to a lesser extent some prescriptions where it is less than this power.
Winged Drone | Alate | Male Ant. Drones are the only male ants in a colony. They are born from un-fertilized eggs. Drones are not like typical ants. They donât do any work in their nests, and they look more like wasps than ants. They are reproductive winged ants and so are alates.
Which insect is called king of insects? The king of insects would be the ant. This is because the ant has a  huge population all around the world, they have extreme powers of  destruction and they have superior orâ¦ganizational skills. 5 people found this useful.