| http://www.w3.org/ns/prov#value | - Carbon isotope ratios in tooth enamel can reveal whether ancient animals ate plants that used what is called C3 photosynthesis ?? trees (and the leaves, nuts and fruits they produce), shrubs, cool-season grasses, herbs and forbs ?? or plants such as warm-season or tropical grasses and sedges that use what is known as C4 photosynthesis. (Sedges vaguely resemble grasses, but their stems?? cross-sect
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