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2 is correct if I'm not mistaken
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Scientists usually use the potassium-argon method to date rocks that are older than about 1 million years. Uranium-238 is also used for radiometric dating. It has a half-life of 4.5 billion years. It decays to produce lead-206.
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Like the human body, the bicycle relys on other things to keep moving. For example, in order for the bicycle to keep moving, the rider needs to have legs and be able to push the pedals foreward. In order to breath, the body needs to have lungs and those lungs depend on the heart to pump blood throughout the body. The lungs rely on the heart and your brething relys on your lungs. Hope this helped, brainliest always appreciated.
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