That's part of the theory of evolution by natural selection (Darwinism) but not the main principle, and some other (obsolete) theories also included this belief. I don't know if there is a more specific answer, but if you can't find one, just go with natural selection.
Yes. Evolution ocurred in all geologic periods.
Evolution
Seasons :)
The Geologic Time Scale is broken up into several periods of time, during which there were great changes in the biodiversity on Earth. We can see distinct changes in the flora (plants) and fauna (animals of each time period. The age range of each period is determined by radiometric dating.
They can be. Atmospheric changes, location of continents, and solar output could also cause them.
Darwin's theory is correct but the smaller parts within that answer is called Gradualism which is more commonly used
It's Evolution
Changes over species over long periods of time is known as evolution.
Evolution.
The punctuated equilibrium model of evolution holds that evolution occurs in spurts, with species evolving relatively rapidly, and then remaining unchanged for long periods.
Punctuated Equilibrium, I believe is the answer.
I think its to make persons in a organization aware of certain changes.
Punctuated Evolution or equilibrium
Generally, evolution of several species occurs during periods of adaptive radiation. These new species have evolved to "adapt" to new environments created by changes like massive flooding around continents and changes to the sea floor.
Evolution
Yes. Evolution ocurred in all geologic periods.
The gradual change in the characteristics of a species over time is called evolution. The theory of evolution by natural selection was first proposed by Charles Darwin.