SAT motion problem... can someone help me out and if you can please explain :) Tanks

Summarize the work of famous environmental scientists of the past.

Abacterium was found to contain a sequence of atcgggatcct in its genome. a few generations later, the sequence was found to be atcatcct. what type of mutation caused this change in the bacteria? a. duplication b. insertion c. inversion d. translocation

If the null hypothesis is false and the researchers do not reject it a type 2 error has been made. true or false