As background, a brief history is presented of what new information caused the classification of living things to evolve from the original 2 Kingdom classification of Animals and Plants by Linnaeus in the 18th century to the present day 6 Kingdoms: Animal, Plant, Fungi, Protista, Eubacteria, and Archaebacteria.
All organisms in the Animal Kingdom are multi-cellular, heterotorphic, most are mobile although a few such as anemomes are not, and most reproduce sexually although a few such as aphids can also reproduce asexually. All have specialized cells and tissues, and most have organ systems.
Plants are multicellular, with specialized interdependent cells and tissues. Movement is limited and in response to sensory stimuli. Nutrition is autotrophic. Many reproduce both sexually and asexually, and some simpler plants have complex life cycles involving both sexual and asexual phases.
Fungi can be multicellular or single celled such as yeast, but all have distinctive common characteristics. They are heterotrophic. Multicellular fungi grow tubular hyphae which secretes enzymes to digest food outside their body, before ingesting it. Reproduction is widely varied: sexual and/or asexual including budding.