In which of the following levels of biological classification do humans belong?

Humans belong to the kingdom Animalia, which encompasses all animals. This classification is fundamental in biology as it distinguishes between different types of organisms based on shared characteristics. Within the kingdom Animalia, humans are categorized under the phylum Chordata, which includes animals with a notochord; further classification places humans in the class Mammalia (mammals), which are characterized by the presence of mammary glands, and subsequently in the order Primates, family Hominidae, and genus Homo.

The other groups listed—Plantae, Fungi, and Protista—represent entirely different kingdoms. Plantae consists of all plants, which are primarily photosynthetic organisms; Fungi includes organisms such as mushrooms and mold, which absorb nutrients through external digestion; and Protista comprises diverse single-celled or simple multicellular organisms that do not fit into the other categories, such as algae and protozoa. Hence, the classification of humans as part of Animalia is rooted in the significant biological and physiological traits that define animals as a whole, distinguishing them clearly from these other kingdoms.