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The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

What is responsible for the uneven heating between the poles and the equator on any given day

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above