A DNA segment is changed from GTCACGATT to GTCAACGATT. This is an example of which type of mutation? Insertion mutation
Deletion mutation
Point mutation
Substitution mutation

insertion mutation

Explanation:

an extra one has been inserted into the DNA segment making it insertion

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.