The horizontal axis represents cusp index, an index for cusp development, and the vertical axis represents the proportion of zooplankton in each seal's diet. Ishihara U, Miyazaki N, Yurkowski DJ, ...
A group of marine mollusks called chitons produce extraordinarily tough teeth, which they use to scrape algae off rocks for food. Now, researchers report the protein RTMP1 (radular teeth matrix ...
Goldstein, Marcus S. 1931. "The cusps in the mandibular molar teeth of the Eskimo." American Journal of Physical Anthropology, 16, (2) 215–235.
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