2. variations allow some individuals to be more or less fit than others. For any character within a species, there is a range of variation. What happens a. New species is formed when sufficient variations accumulate to reproductively isolate the new populations from the initial one. If a population can not adapt to meet the changes, extinction occurs.
Species can split to form several new populations if they evolve separately.
Populations may not be able to respond and go extinct. More offspring e. Fitness increases chance of survival 8. Changing Environments a. Broad range of variations i. more likely to have some individuals survive. Species is subdivided i. part of the species is isolated from another part.