Paleoecology is the study of the composition and distribution of past ecosystems, is tooth marks in fossil shells.
What does a paleoecologist do?
A Paleoecologist examine the ecosystems of the history.
Through data gathered from fossils and types, examiners can specify the links and connections of living things and their surroundings in the history.
Thus, option "3" is correct, tooth marks in fossil shells.
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