Biologists classify organisms to organize and keep track of the enormous variety of life forms, to better understand evolutionary distances, and to examine the relationships between organisms. Life on earth is incredibly diverse, with millions of different identified species.
The basic system of classification for biology was originally devised by Swedish doctor and botanist Carolus Linnaeus. Linnaeus devised a system in which organisms are grouped under increasingly specific sub-categories, ranging from (at the broadest level) order, to family, genus and species (at the most specific level). For example, humans are classified as "Homo sapiens," with Homo being the genus and sapiens being the species. Linnaeus's basic system of classification is still used by biologists today.Learn More
Biologists who study the relationships between animal groups are known as taxonomists, and they have a wide array of tools at their disposal for determining the exact phylogeny of organisms. Among these are gross anatomy, protein similarity and direct gene sequencing, as related by Rediscovering Biology.Full Answer >
All organisms that are found in the chordata phylum of animals have a dorsal nerve cord at some point in their lives. The dorsal nerve cord is an embryonic feature of chordatas. There are three chordata subphylums: vertebrata, urochordata and cephalochordata.Full Answer >
Omnivores are organisms that eat foods from both animal and vegetable sources. Small insects, human beings, some small animals, birds and reptiles are all examples of omnivores.Full Answer >
Kingdom Protista includes mostly unicellular, eukaryotic life forms that behave similar to animals, plants and fungi based upon how the organisms obtain nutrition from their environment. These creatures do not fit into other kingdoms of life, mostly live in water and have a nucleus in their cells.Full Answer >