8. If you are missing or have an extra base at the end of your mutated DNA. What type of mutation occurred?
A Substitution
B Duplication
C Insertion

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"