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Biologists have long maintained that two groups of pinnipeds, sea lions and walruses, are descended from a terrestrial bearlike animal, whereas the remaining group, seals, shares an ancestor with weasels.

上文第三句以趨同進(jìn)化解釋一種現(xiàn)象：鰭足確實(shí)有可能是為了適應(yīng)水中生活而作出的一個(gè)必要的反應(yīng)有A片网站吗?；龜在线69、鯨魚以及儒艮同樣都長(zhǎng)有鰭足。

Like other herd-dwelling pinnipeds, fur seals follow a yearly cycle that begins in May when the 450-to 600-pound bulls return to the rookery to stake out prime breeding turf.

象其它牧群住宅pinnipeds成人精品视频在线日韩免费观看网址，毛皮封印跟隨開(kāi)始在5月的一個(gè)逐年周期當(dāng)450 對(duì)600 磅公殴访朗私回到群到鐵砧在頭等育種的草皮之外。

And though the walrus is an Arctic species and thus much harder to study in the wild than the elephant seals and sea lions that flop onto the beaches of Northern California, scientists are gathering evidence that Odobenus is the most cognitively and socially sophisticated of all pinnipeds.

由於海象是北極物種国产又粗又猛又爽在线观看，因此在野地觀察研究国产真实偷乱视频老人，遠(yuǎn)比會(huì)跳上北加州海灘嬉戲的象海骨M海獅棘手【犯＠谙呤悠担科學(xué)家正在搜集證據(jù)www.美女中文字网络，盼能證明海象的認(rèn)知及社交能力，強(qiáng)過(guò)所有鰭足類天天日天天色天天干。

Flippers may indeed be a necessary response to aquatic life;turtles, whales, and dugongs also have them. But the common detailed design found among the pinnipeds probably indicates a common ancestor.

有讓步就有轉(zhuǎn)折人人揉人人操人人爽，下一句的轉(zhuǎn)折暗示新觀點(diǎn)的出現(xiàn)：但在鰭足亞目動(dòng)物之間所發(fā)現(xiàn)的那種普遍的細(xì)致構(gòu)造可能表明它們來(lái)自共同的祖先。

The author implies that which of the following was part of the long-standing view concerning pinnipeds?

問(wèn)題是&作者暗示下列哪個(gè)觀點(diǎn)是關(guān)于鰭足亞目動(dòng)物的長(zhǎng)期看法的一部分&久久这里只有欧美精品。

Agile and Active Pinnipeds：靈巧活潑的鰭腳類

海洋巨獸--鯨Huge Animals in the Ocean-Whale | 靈巧活潑的鰭腳類Agile and Active Pinnipeds | 美人魚儒艮Mermaid Dugong