Humans are classified within the kingdom Animalia because they share key characteristics common to animals.These include,Multicellularity: Humans are made up of many cells.Eukaryotic cells: Human cells have a nucleus and other specialized structures.Heterotrophic nutrition: Humans obtain energy by consuming other organisms, not by producing their own food like plants.Lack of cell walls: Unlike plants and fungi, animal cells, including human cells, do not have rigid cell walls.Movement: Humans have the ability to move voluntarily at some stage in life.Complex organ systems: Humans have specialized tissues and organs for functions like digestion, respiration, and reproduction.Because humans exhibit all these animal traits, they belong to the kingdom Animalia.