I've got an interview for an ecology and evolution project coming up, and the number one thing I'm worried about is answering this big, open-ended, and very important question. If I were to answer this, I would say that the topic I'm most interested in is species interactions. I'm interested in species interactions because of how they can influence the evolution and diversification of both interactors. However, I feel like that answer is just a pile of word mush and basically boils down to "I want to do this 'cause it's cool". How do you eloquently answer this kind of question? I do have a passion for these topics, I just can't explain why.
It would help me to know what other people's answers are to this question, so my question to you all is: why do you want to study what it is that you're studying?