Speciation due to divergence of isolated populations can be gradually
- Gradualism: gradual divergence over long spans of time. The changes are small, continuous and slow. The assumption that large changes occur as an accumulation of many small ones.
- Speciation can occur gradually over long periods of time, with several intermediate forms in between species leading to the current species.
- Can be seen in more complete fossil records; eg, the whale or the horse.
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