A mutation is a (chance) of genetic material. Many mutations are (neutral) (meaning not helpful nor harmful)

mutations Insertions and deletions are (?)

An insertion changes the number of DNA bases in a gene by adding a piece of DNA. As a result, the protein made by the gene may not function properly. Deletion. ... This type of mutation occurs when the addition or loss of DNA bases changes a gene's reading frame.

this is a good question! i'll do some research and come back when i have the answer!