Dude all the question is asking you is too choose 5 activity that you would plan on doing in the future.
There are three main differences between nuclear and mitochondria DNA (mtDNA): 1.) mtDNA is circular, whereas nuclear DNA is linear. (Both are double stranded) 2.) mtDNA is (generally) uni-parentally inherited, in most animals (not mussels though for example), mtDNA is passed from mother to offspring. from wiki
Him.
If you don't know how to solve this, you can put each word in to the blank and see which sounds right.
The answer is I was unsure how to react.
Hope this helped :)