Adaptive radiation is a rapid form of speciation that takes place when there is a mass immigration to new ecological niches, or a mass extinction of one dominant life form opening up niches for other...
Allopatric speciation and sympatric speciation are two factors.Allopatric speciation occurs when physical barriers are formed, separating the specie. This will cause the specie to evolve at different...
Adaptive radiation is the evolution of many diverse species from a common ancestor. After a mass extinction those individuals that were able to survive no longer have competition so they are able to...
The "lead" in your pencil is made of carbon (graphite), and has no lead in it. Lead, Pb, several different radioactive isotopes, some of which are radioactive and release radiation.