As demand increases for fossil fuels and proven reserves begin to dwindle, we turn to unconventional resources such as:

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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 are the doorways into and out of cells, attached to the membrane, and built in the rough er.