Which of the following statements are correct?
I. Directional selection favours one extreme form over the other extreme and over intermediate forms of a
trait
II. Stabilising selection favours the intermediate forms of a trait
III. Disruptive selection favours both the extreme forms of a trait
IV. Fossils are the remnents of hard parts of life forms present in rocks
V. A study of fossils in different sedimentary layers indicates the geological period in which they live
VI. Radio isotopes are often used to determine the age of the fossils
VII. Study of fossils is called Palaeontology
VIII. Most fossils are found in sedimentary rocks
IX. The unit of evolution is population
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