Regena, age 50, is likely to have than 25-year-old owen. a smaller thymus thicker cartilage in the joints more fast-twitch muscle fibers softer artery walls

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ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called