Evolution, Unity, and Diversity
Diversity and Unity
Diversity is a prominent feature of life, with 1.5 million documented species. With thousands added to the list each year, some estimate the total diversity range to be anywhere from 5 to over 30 million species. In face of this complex nature of diversity, biologists group and classify species, which is known as taxonomy. Classifications range on the number of kingdoms, but an even broader classification rests on the three domains: Bacteria, Archea, and Eukarya (only domain with eukaryotic cells). The two former domains consist of organisms with prokaryotic cells; most are unicellular. The latter domain contains organisms such as single-celled prokaryotes, plants, fungi, and animals.
With respect to such classifications, it may be different to approach the subject of a unifying theme amongst this documented diversity. However there exists striking examples of unity, especially at the lower levels of biological organization. DNA is perhaps the most important example, yet others exist such as the cellular structure in eukaryotes. On higher levels unity still remains an important task for biologists, which leads directly to evolution.
Evolution studies the background of life forms and unifies common ancestors, especially in prokaryotes.In 1859 Charles Darwin pioneered the awareness of evolution with his book "The Origin of Species". Darwin used to main concepts, the content of evolution and the process of evolution, natural selection. He noticed the adaption of species with regard to their environment, and how these traits of survival are passed to offspring.
As these species pass favorable traits, descent with modification accounts for the unity and diversity of life.As species pass on specific genetic adaptation traits to their offspring, this accounts for the diversity which grows (genetic adaptations form new species) and resides in the unity (the same genetic code is still intact).
- What are the three domains? Give examples of each.
- What are the two ideas founded in The Origin of Species?
- How is unity and diversity inherent in evolution?