Sea eel breathes or is a paper.
All eels are fish.  No fish are plants.  A thing is either a plant or animal. Nothing that breathes is paper.  All animals breathe. If a sea eel is either an eel or a plant, then a sea eel is an eel or an animal.
∀x  (Eel (x)→  Fish (x)) ∀x  (Fish (x)→ ¬ Plant (x)) ∀x ( Plant (x) ∨  Animal (x)) ∀x  (Breathe (x)→ ¬ Paper (x)) ∀x  (Animal (x)→  Breathe (x))  Eel (seaEel) ⊕ Plant (seaEel) → Eel (seaEel) ∨ Animal (seaEel) 