I think the correct answer is c
Answer:
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1. earthquake measures
2. b
3. seismograph
Given the age of the meteorite is 4.5 billion years old with 78 atoms of lead-206 the answer should be B. 156. The half-life of uranium-238 in order to decay into lead-206 is 4.46 billion years, which means that the original number of atoms is 156.
Retina allows the eye to regulate how much lint can enter.
