Asample of moon rock was found to contain 40 argon-40 atoms for every 5 potassium-40 atoms. the half-life of postassium-40 is 1.25 billion years. assuming no loss of daughter isotopes, how old is the moon rock? a) 3.75 billion years old b) 2.5 billion years old c) 10.5 billion years old d) 6.75 billion years old
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Biology, 21.06.2019 23:30
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
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Biology, 22.06.2019 06:00
Sarah and john are having a discussion on genetic diversity. sarah believes that it happen over a long period of time. john it happens immediately. who is correct? a. sarah is correct because genetic diversity occurs over a long period of time. b. john is correct because genetic diversity occurs immediately. c. both are correct because genetic variation can occur or long period of time. d. neither are correct because genetic diversity occurs over any period of time
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Biology, 22.06.2019 10:50
Overtime the pond slowly becomes more acidic due to the release of chemicals from a nearby factory. which of the organisms would most likely survive the change to their environment?
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Biology, 22.06.2019 12:00
Matched chromosomes carrying information about the same characteristics in the organism are called
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Asample of moon rock was found to contain 40 argon-40 atoms for every 5 potassium-40 atoms. the half...
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