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.
Additionally, animals are referred to by different terms in other countries (or even local communities). Also, in many species, young are called 'whelps', chits etc., males and females that have reproduced are called sires and dams respectively, and a group of related young are called a litter.Occasionally there is a term for a 'neutered' male or female, and in that instance if we have the term, we note include it.lso, in many species, young are called 'whelps', chits etc., males and females that have reproduced are called sires and dams respectively, and a group of related young are called a litter.