Which one(s) is / are correct? (a) Most fossils are found in sedimentary rocks (b) According to ...

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Which one(s) is / are correct?
(a) Most fossils are found in sedimentary rocks
(b) According to Lamarck, a giraffe has a long back because its ancestors stretched their necks to get food.
(c) The unit of evolution is population
(d) All of the above
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