content is decreased. These stages, in order, are a. Bituminous, peat, lignite, anthracite b. Peat, lignite, bituminous, anthracite c. Peat, lignite, anthracite,bituminous d. Lignite, bituminous, anthracite, peat e. Anthracite, bituminous, peat, lignite 6. High rates of species extinction caused by human activities have taken place at which of the following times in Earth’s history? I. At the end of the Permian period II. At the end of the Cretaceous period III. During Recent times a. I only b. II only…
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