Fungi contain many different microscopic organisms compared to regular plants, Fungi can be very poisonous compared to plant too and also a regular plant contains a cell wall where as Fungi don't. Most importantly plants use the process photosynthesis to make their own food, Fungi don't.
That organism might rely on the diffusion of oxygen and carbon dioxide through their outer body covering if it's : B. small and lives in water
Organisms that live in water cannot get their oxygen with the same process like we did on the land. They need the process of diffusion in order to do it
Hope this helps
Adrenocorticotrophic hormone (ACTH)
Thyroid-stimulating hormone (TSH)
Luteinising hormone (LH)
Follicle-stimulating hormone (FSH)
Prolactin (PRL)
Growth hormone (GH)