Why are Explosive Eruptions so violent?

Blood, made up of red and white blood cells, work together to form

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction. this is an example of speciation.

How does the study of genetic disorders such as pku biologists understand normal alleles?