Get the answer of: What Caused Mass Extinctions ? It becomes clear that there is an intense amount of interconnectivity between the aspects of the biosphere. At the cellular level, there is a symbiotic effect and it continues up throughout the chain of organisms all the way to the biosphere levels. This interconnectivity can have positive effects, but it can [...]
This article throws light upon the four main categories of Speciation. The categories are: 1. Allopatric Speciation 2. Parapatric Speciation 3. Sympatric Speciation 4. Alloparapatric Speciation. Category # 1. Allopatric Speciation: Allopatric speciation occurs when the new species evolves in geographic isolation from the parent species. The species range, becomes subdivided by a barrier such as a new mountain range [...]
There are three theories that have been put forward to explain the mode of evolution i.e., origin of species. 1. Lamarck's Theory of Evolution: Lamarck proposed that the evolution of life forms had occurred by the use and disuse of organs. He gave the example of Giraffe, which initially did not have long necks. But, in order to reach the [...]