This clip is from the series Hunting for History. Suitable for: History at KS3 in England Wales and Northern Ireland and 3rd and 4th level People, past events and societies in Scotland.

Two-dimensional (2D) shapes are completely flat. They have two dimensions – length and width. A polygon is a closed 2D shape with straight sides that meet at vertices. Polygons can be regular or ...

Genetic variation describes the genotypic and phenotypic differences between individuals in a population, and between populations. This variation arises through genetic mutation and is important ...