I’m not entirely sure about what you’re asking but chargaff’s rule is the thing that states that the amount of each “letter” in DNA is equal to its pair. Guanine (g) pairs with cytosine (C) and the same with adenine(A) and thymine (T). I’m sorry my answer is so vague, but I hope it helps a little!
I believe the answer is Planet Nine.
I know it’s a fungus (I think it’s honey fungus) but it’s heterotrophic because it doesn’t make its own food