Radical fractures in a piece of glass look like

 The correct answer is :  They look like the spokes of a wheel

Explanation:  Fractures that tend to occur first when a glass panel is hit, are radial fractures. Radial fractures are cracks in the form of radii that occur at the circumference of the blow, originate at the point of impact and are formed on the opposite side to which the impact is received.

it has one origin of replication, but it proceeds in two directions - d)

your answer is rna to the question.