eukarya because eukaryotes have a nucleus, hope this helps ^.^
You should expect an endangered species to be more SPECIALIST. Animal species that can live in different types of environment and which can survive on different types of food are called generalist. This type of animal specie can not be easily endangered because they have high level of survival. The specialist animal species on the other hand are adapted to a narrow range of food and environment. Specialist species can be easily wipe out if there food resources is exhausted or if their habitat is destroyed.
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The toxic sludge covers the animals completely, and then they suffercate and dye, I don't know how else to say that
Organization is important because the structure denotes the function in biology, therefore organization in this case means that it has a high relevance for homeostasis. If something is not organized, it's not in homeostasis, it's as simple as that.
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Hope the above picture might help you :)