Answer: The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.
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I would assume it to be a fault - block mountain.
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Answer: The monomer units of DNA are nucleotides.
Explanation: Hopefully this was helpful :)
Answer:
X represents ATP (Adenosine TrisPhosphate) or simply put Energy.