Answer:
This organism belongs to the kingdom Fungi.
Step-by-step explanation:
Kingdom fungi include heterotrophic organisms. Their bodies are made up of hyphae which are the thread-like structures. Many hyphae together form an entangled mass called mycelium. Fungi are eukaryotes as they have a well-defined membrane-bound nucleus in their cells. Fungi absorb food from their surroundings with the help of their hyphae. Fungal cells have cell walls around their plasma membrane.
They are mostly multicellular; however, yeast is unicellular. Chitin is the major component of their cell walls. Since the observed organism is a multicellular and eukaryotic organism that derives nutrition from the surroundings and have a filamentous structure, it belongs to the kingdom fungi.