patterns of evolution

Evolution and Classification - In spite of many evidences, studies and theories, we are still not aware of how the evolution actually occurs. If we go backwards at some point in the history of the earth it would have consisted of only the basic elements, the non-living materials..

Evolution Should not be Equated with Progress - All of the changes, diversifications, and extinctions that happened over the course of life's history are the patterns of overall evolution. Evolution of life has been taking place for about 3.8 billion years of..

Variations, the raw materials for evolutionary change, are controlled by genes. When there is an error in DNA copying during sexual reproduction it leads to variation. Variations occur due to microevolution, that is, evolution on a small scale-within a species or a single population. It ..

The comparative anatomical studies of various types of organisms shows structural and functional differences and similarities between various species. For example, the basic structure of all the flowers is the same with the whorls of calyx, corolla, androecium and gynoecium. However, each species i..

Geological Distribution - The organisms show particular patterns of distribution on earth. The distribution of the species give an indication of how the earth was earlier. It is believed that the earth was a single mass called the Pangea. It consisted of two large continental masses calle..

Question: Evolution The cry of the bird, which perceives the cat, is a sounding-signal, and the birds may have only this single kind of signal. But that is sufficient as they are able only to perform one kind of adequate behaviour. They need no more signals, as the adequate react..