PH3-4. It says suggest so try getting a close and appropriate answer after adding an acid to an alkaline.
Answer:
none of the above is the answer
Answer:
Because the interstellar medium is 97% hydrogen and 3% helium, with trace amounts of dust, etc., a star primarily burns hydrogen during its lifetime. A medium-size star will live in the hydrogen phase, called the main sequence phase, for about 50 million years. Once hydrogen fuel is gone, the star has entered “old age.”
