Okay a dichotomous key is where you basically create a key to where others find out what kind of animal is the one they're trying to find out. I would suggest using Google to look up examples. It would probably benefit you the most.<span />
There may not be any predators for that new species. Therefore that specie is able to breed continuously and have no control over the population. Or it may bring diseases with it from its previous destination giving those diseases to the animals living in new ecosystem. Those animals wouldn't have resources or any adaptability to fight it off
Oooondisnxjd skdisbis c xkd xkd djiddiis
Im not sure how to answer this since there were no choices given but I will answer by telling you what nuclear fusion is...
so basically nuclear fusion is the merging or combining of 2 isotopes, typically isotopes of hydrogen, under conditions of extreme temperature and pressure thus resulting in the release of massive amounts of energy. I think the answer to your question would be new types of electricity because the heat emitted from the reaction could be turned into electricity by using its steam. This is what happens in nuclear reactors
i hop this answers your question