A. consist of Calcite and aragonite
B. from hard parts of animals or plants
C. still in the shape of the original animal or plant
D. animals or plants common for fossilization
Đáp án là A.
Ý trong bài: The best fossils are those composed of that form the vast majority of unaltered fossils. Calcite and aragonite also contributed to a substantial number of fossils of certain organisms.
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