Good ol' punctuated equilibrium.
They thought the evolution of new species is linked to environmental changes
Species.
Variation within the species would mean that individuals are likely to react differently to environmental change. This means that they may not all have a negative reaction, and therefore the species is more likely to survive.A large population is also important in limiting the risks of environmental influence - as changes may not reach or affect the entire population.
Adaptation is the process by which a species changes over time to survive in its habitat.
And changes in allele frequency of populations; genes in genomes. Also in the behavioral repertoire of species.
Good ol' punctuated equilibrium.
Good ol' punctuated equilibrium.
Good ol' punctuated equilibrium.
Good ol' punctuated equilibrium.
Good ol' punctuated equilibrium.
because they are
Species stay the same for a long time and then change quickly due to environmental changes.
Changes gradually because each species responds differently to changes in environmental factors.
Good ol' punctuated equilibrium.
extinct
The term you're looking for is 'punctuated equilibrium', a model formulated in the 1970s by Stephen Gould and Niles Eldredge.This model describes how species can change very little over longer periods of time, followed by a shorter period of rapid change.To say that the only factors affecting those developments are environmental changes is oversimplifying the model a bit, I think. The period of rapid change could be triggered by anything from changes in the environment to population growth to changes in the structure of the population, and so on.
extinct