→ eldar:為了適應潛水，cetacean有1. enlarged space in jawbone, 09/27 22:15
→ eldar:2. blowhole. Pakicetus沒有這兩者 09/27 22:16
→ eldar:...blowhole, (which is) another cetacean adaptation.... 09/27 22:17
The fossil consists of a complete skull of an archaeocyte, an extinct group
of ancestors of modern cetaceans. Although limited to a skull, the Pakicetus
fossil provides precious details on the origins of cetaceans. The skull is
cetacean-like but its jawbones lack the enlarged space that is filled with
fat or oil and used for receiving underwater sound in modern whales.
Pakicetus probably detected sound through the ear opening as in land mammals.
The skull also lacks a blowhole, another cetacean adaptation for diving.
Other features, however, show experts that Pakicetus is a transitional form
between a group of extinct flesh-eating mammals, the mesonychids, and
cetaceans. It has been suggested that Pakicetus fed on fish in shallow water
and was not yet adapted for life in the open ocean. It probably bred and gave
birth on land.
題目是
Pakicetus and modern cetaceans have similar
(B) adaptations of diving
(C) skull shapes
答案是C但我寫B
我知道C是對的但是第七行的another cetacean adaptation for diving又
要怎麼解釋呢??
謝謝大家
最近有點被托福弄的瘋瘋癲癲啊@@
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※ 編輯: vul3sm3c96 來自: 61.228.242.42 (09/27 21:51)