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ancestor

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definition: 
An early type of animal or plant from which others have evolved:A person, typically one more remote than a grandparent, from whom one is descended:
sentence: 
The ancestor of all placental mammals including almost all species of mammals living today was a tiny, furry-tailed creature that evolved shortly after the dinosaurs disappeared
difficulty: 
medium
toefl frequency: 
2
toefl classification: