Animal Kingdom Quiz

Kingdom of Living Things:

• Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia.

• As of 2022, 2.16 million living animal species have been described, but it has been estimated there are around 7.77 million animal species in total.

• Animals range in length from 8.5 micrometres (0.00033 in) to 33.6 metres (110 ft).

• Most living animal species are in Bilateria, a clade whose members have a bilaterally symmetric body plan.

• Historically, Aristotle divided animals into those with blood and those without.

• Carl Linnaeus created the first hierarchical biological classification for animals in 1758 with his Systema Naturae.

• Animals have several characteristics that set them apart from other living things, such as being heterotrophic and motile.

• All animals are composed of cells, surrounded by a characteristic extracellular matrix composed of collagen and elastic glycoproteins.

• Nearly all animals make use of some form of sexual reproduction.

• Animals are categorised into ecological groups depending on how they obtain or consume organic material.

• Animals originally evolved in the sea, and lineages of arthropods colonised land around the same time as land plants.

• Animals are monophyletic, meaning they are derived from a common ancestor, and are sister to the Choanoflagellata, with which they form the Choanozoa.Animal Classification Summary

• Sponges are the oldest animal phylum and lack complex organization and distinct tissues.

• Ctenophora and Cnidaria have radial symmetry and a single digestive chamber, but distinct tissues are not organized into organs.

• Bilateria animals have bilateral symmetry, three germ layers, and a complete digestive tract with a mouth and anus.

• Bilateria animals have a head end, tail end, back surface, belly surface, and a left and right side.

• Protostomes and deuterostomes differ in embryonic development, mesoderm formation, and digestive tract development.

• The Ecdysozoa are protostomes that grow via moulting and include arthropods, roundworms, and other small phyla.

• The Spiralia are protostomes that develop via spiral cleavage and include the Lophotrochozoa and Platytrochozoa.

• The Lophotrochozoa include molluscs, annelids, brachiopods, nemerteans, bryozoa, and entoprocts.

• Aristotle divided animals into those with and without blood and arranged them on a scale from man to spontaneously generating creatures like sponges.

• Carl Linnaeus created the first hierarchical classification in his Systema Naturae.

• Animals are exploited for food, textiles, medicine, and experimental models.

• Animals have been the subjects of art, literature, film, mythology, and religion throughout history.