Answer:
Armillaria
Step-by-step explanation:
In fact, the blue whale is not the biggest organism in the world, though it is the biggest animal in the world, the Humongous Fungus is the largest organism in the world. It stretches over 2,385 acres of Malheur National Forest, Oregon. It's our largest organism, and from the way the fungus has been growing, it may also be our oldest organism.