| The oldest extant writing surfaces include Babylonian clay tablets and Indian palm leaves. |
| In Treatise on the quadrilateral al-Tusi gave the first extant exposition of the whole system of plane and spherical trigonometry. |
| The impala and rhebok were also not included in tribe-level analyses because each is the sole extant member of its tribe. |
| Among the 11 extant orders of arachnids, Araneae and Acari are by far the most species rich. |
| His responsiveness to nature recalls one of Atwood's beliefs about qualities extant in much Canadian literature. |
| As often bedevils the translator's task there appears to be at least one lacuna in the extant text, but it was relatively painless to decipher. |
