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richaeviney
25.01.2020 •
Biology
When a helium balloon rises in the air, it expands. if the volume of the balloon doubles, what happens to the density of the helium inside it
a. the density decreases by half.
b. the density doubles.
c. the density stays the same.
d. the density triples
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Ответ:
The brain stem controls blood circulation
Explanation: