As stated, in a punctuated fashion. Organisms can be in stasis, adapted well to their environment for long periods of time, but can undergo rapid evolutionary change ( rapid in the geological sense ) with the proper environmental selection pressure.
Well, you have to be able to understand different aspects of evolution. In this case, there are 2 to consider:
1) Gradualism (Proposed by Darwin)
2) Punctuated Equilibrium (Gould and Eldredge)
In gradualism, the idea is pretty much that over time, we constantly and consistently came to be who we are. Butterflies today are who they are today because of constant changes over time. I guess you can think of it as one little thing happening at a time to make one whole new big picture (or in this case, organism).
In punctuated equilibrium, it's not constant over time. It proposes pretty much that we are who we are today because of set intervals of time where evolution occurred. For example, many years ago, we would have been apes. It followed for 2000 years then in a 10 year interval, we became another form, then 6000 years later, in a random 15 year interval, we became a closer form of human.
Hope that clears things up..
MG
Species stay the same for a long time and then change quickly due to environmental changes.
Punctuated Equilibrium, I believe is the answer.
It is called Punctuated Equilibrium. Some Evolutionary apologists, notably Richard Dawkins, have down played this aspect of Neo-Darwinistic theory.
Punctuated equilibrium
This is the idea called punctuated equilibria, by paleontologists Stephen Jay Gould and Niles Eldredge. It explains the patterns seen in the fossil record.
Yes. Evolution via punctuated equilibrium still depends on natural selection. In punctuated equilibrium there are long periods in which most species are well-suited to their environments, and so there is is little selective pressure to change. These periods are punctuated by times of more rapid environmental change and greater stress, which results in greater selective pressure for populations to change.
Punctuated Equilibrium, I believe is the answer.
Punctuated equilibrium
Punctuated equilibrium
Punctuated Equilibrium - album - was created on 2009-01-26.
zeological instrument of panther of indigeneous snake can do anything cause the punctuated equilibrium.
punctuated equilibrium
Punctuated Evolution or equilibrium
over several thousand years the birds descendants evolve webbed feet and begin to feed on fish. is this an example of gradualism or punctuated equilibrium?
It is called Punctuated Equilibrium. Some Evolutionary apologists, notably Richard Dawkins, have down played this aspect of Neo-Darwinistic theory.
Punctuated equilibrium.
The punctuated equilibrium hypothesis is a theory that most species have little evolutionary change throughout their geological history. They will remain in a state of stasis.
No difference.