It is called Punctuated Equilibrium. Some Evolutionary apologists, notably Richard Dawkins, have down played this aspect of Neo-Darwinistic theory.
The hypothesis of punctuated equilibria.
punctuated equibria
The theory of punctuated equilibrium.
Equilibrium
punctuated equilibrium
According to the biological species concept, when the new species no longer can interbreed with the ancestral species, or with the population that it has been geographically isolated from long enough to have allele change significantly enough to prevent interbreeding.
Species survive, evolve, and create speciation by finding a niche. This means that they find an area where they are able to benefit from food, shelter, and protection from predators.
New species evolve from a previous existing species. As challenges arrive in the environment of the old species over many many generations body features are lost and/or gained. Eventually the old species will either eventually die out or change habitats. So basic evolution.
punctuated equilibria accounts for the gaps in the fossil record. Species evolve quickly during relatively short periods. Tiny changes in a species gradually add up to major changes over very long periods of time. Gradualism proposes that evolution occurs slowly but steadily. These periods of rapid change are separated by long periods of little or no change.
punctuated equilibrium
punctuated equilibrium
Punctuated equilibria is a theory in evolutionary biology that suggests species undergo long periods of relative stability (stasis) punctuated by sudden and rapid evolutionary change. This theory contrasts with gradualism, which proposes that evolution occurs steadily over long periods of time.
Punctuated equilibrium See link below.
Evolve.
Evolve
evolution.
Species can change is there is a mass extinction or if the type of species changed the type of climate or terrain which would would make the species evolve to its new environment so that it can survive.
mew is a different species m8. it doesn't evolve
Environmental change and variation :)
As they adapt to their environment, they slowly change over time. They are said to Evolve.
reproductive isolation: the gene pools of two populations must become separated for them to become new species. As new species evolve, populations become reproductively isolated from each other.