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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