Identify the type of mutation shown in the diagram, with respect to chromosome 20.

Here are the choices: 
(a) deletion(b) inversion (c) duplication(d) insertion 
(d) insertion 
This mutation occurs when (an) additional nucleotide base pair/s attach themselves into an existing DNA strand. This can possibly result to diseases such as cystic fibrosis and myotonic dystrophy. 

Size and shape of continents

Giga is the second highest prefix on the normal scale, the first is terra.