Animal kingdom
This describes a fungus. Fungi are multicellular, heterotrophic eukaryotes that obtain nutrients by absorbing them from their surroundings.
Animals are multicellular, heterotrophic organisms with specialized tissues and organs for different functions, while protists are mostly unicellular or simple multicellular, with a wide range of nutritional modes including autotrophic and heterotrophic.
Fungus
I think you mean heterotrophic, and no, humans are not. We are however; multicellular chemoheterotrophs.
Forelimbs.
The kingdom of protists has both heterotrophs, autotrophs, and uni/multicellular organisms.
Multicellular and motile organisms belong to the kingdom Animalia. This kingdom includes a diverse range of organisms that are multicellular, heterotrophic, and capable of locomotion at some stage of their life cycle.
Komodo Dragons are multicellular and heterotrophic.
Animals (the animal kingdom), by definition, are multicellular and heterotrophic. Animals cannot produce their own food. They feed on other organismal sources for their energy. They feed on plants or other animals. Thus be their definition of heterotrophic. All animals (whether Chordata, Echinodermata, Porifera, Placozoa, Annelida or Arthropoda) are all heterotrophic and all multicellular. Even tiny things like placozoans and rotifers are multicelled.Fungi cannot produce their own food either. Thus they may be called heterotrophic. They acquire their food by growing in it. Thus they acquire the label saprophytic as well. The fungal kingdom features both unicellular and multicellular organisms. Toadstools, mushrooms, bread mould, fruit mould and such are those that are multicellular.
Animals (the animal kingdom), by definition, are multicellular and heterotrophic. Animals cannot produce their own food. They feed on other organismal sources for their energy. They feed on plants or other animals. Thus be their definition of heterotrophic. All animals (whether Chordata, Echinodermata, Porifera, Placozoa, Annelida or Arthropoda) are all heterotrophic and all multicellular. Even tiny things like placozoans and rotifers are multicelled.Fungi cannot produce their own food either. Thus they may be called heterotrophic. They acquire their food by growing in it. Thus they acquire the label saprophytic as well. The fungal kingdom features both unicellular and multicellular organisms. Toadstools, mushrooms, bread mould, fruit mould and such are those that are multicellular.
The kingdom Animalia contains the most complex organisms on the planet that are multicellular and heterotrophic. These organisms have specialized tissues and organ systems, showcasing high levels of complexity compared to other kingdoms such as Plantae or Fungi.
If an organism is multicellular, heterotrophic (cannot make its own energy), and has no cell wall, it is an animal. This is the definition of the kingdom Animalia. There are unicellular animal-like members of the kingdom Protista commonly called protozoa. Fungi are heterotrophic and multicellular, but they have a cell wall made of chitin.