A. Fossils are remains of hard parts of life forms in Rock. B. A study of fossils in different s...

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A. Fossils are remains of hard parts of life forms in Rock.
B. A study of fossils in different sedimentary layers indicates the geological period in which they live.
C. Radio isotopes are often used to determine the age of the fossils
D. Study of fossils is called palaeontology
(a) All are correct
(b) All are incorrect
(c) A, C \& D are correct
(d) B \& D are correct
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