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举报参考答案：
混鱼龙是生活在三叠纪中期的一种鱼类。混鱼龙长得很像海豚，嘴巴长而尖，口鼻部窄长，嘴里长有尖利的小牙，可以抓住软体动物。混鱼龙拥有长尾巴，尾巴有下鳍，游泳速度可达每小时40千米它是一种比较原始的鱼龙类，包括多个品种。
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【单选题】Rare FossilRecord The preservation of embryos and juvenilesis a rare occurrence in the fossil record.The tiny,delicate skeletons areusually scattered by scavengers(食腐动物) weathering beforethey can...
A.
"extensive"
B.
"surprising"
C.
"vertical"
D.
"excellent"
【单选题】Rare Fossil RecordThe preservation of embryos and juveniles is a rare occurrence in the fossil record. The tiny, delicate skeletons are usually scattered by scavengers(食腐动物) weathering before they can...
A.
speed of burying
B.
conditions of the water
C.
rate at which soft tissues decay
D.
cause of death of the animal
相关题目：
【单选题】Rare FossilRecord The preservation of embryos and juvenilesis a rare occurrence in the fossil record.The tiny,delicate skeletons areusually scattered by scavengers(食腐动物) weathering beforethey can...
A.
"extensive"
B.
"surprising"
C.
"vertical"
D.
"excellent"
【单选题】Rare Fossil RecordThe preservation of embryos and juveniles is a rare occurrence in the fossil record. The tiny, delicate skeletons are usually scattered by scavengers(食腐动物) weathering before they can...
A.
speed of burying
B.
conditions of the water
C.
rate at which soft tissues decay
D.
cause of death of the animal
参考解析：
混鱼龙是生活在三叠纪中期的一种鱼类。混鱼龙长得很像海豚，嘴巴长而尖，口鼻部窄长，嘴里长有尖利的小牙，可以抓住软体动物。混鱼龙拥有长尾巴，尾巴有下鳍，游泳速度可达每小时40千米它是一种比较原始的鱼龙类，包括多个品种。
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