If I were forced to kill them, Logan Paul would be the most stressful, followed by the jellyfish, followed by the mite, followed by the tree. Why? Because Logan Paul is a member of my species, and I have an evolutionary predisposition to favour members of my own species over members of other species. The rest is an arbitrary ranking based on their ‘benefit’ to my species, and how close to my species I perceive them to be physically; mostly in terms of size and how much independent movement they have.