Will mark !
insect fossils are not very common because:

their bodies are easily destroyed
there were not many insects in the past
insects had hard shells for protection

This question is an opinionated one, and we don’t know anything about the module or anything, thus we can not answer it. but if you are having trouble on what it is asking basically it is just asking to (using your knowledge on the topic) say which topics you were most interested and which were the most challenging.hope this : p