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______ is a naturally reactive element that accounts for 65 percent of the body's mass

User Tscpp
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4 votes

Answer:

oxygen, the answer is oxygen.

User Johar Zaman
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Answer:

Oxygen (65%) and hydrogen (10%) are predominantly found in water, which makes up about 60 percent of the body by weight.

Step-by-step explanation:

User Jonathan Bergeron
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