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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

Greenthe fossil record is the history of life recorded byhuman observationgod.climatologists.remains of the past.

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi