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Answer:
1. Hydrogen gas
2. It begins to collapse
3. After helium is exhausted in the core of a star, it will continue in a shell around the carbon-oxygen core. This can then form oxygen, neon, and heavier elements via the alpha process. In this way, the alpha process preferentially produces elements with even numbers of protons by the capture of helium nuclei.
4. Because of their vast, space-bending gravity. Everything that falls into them is ripped apart in an instant.
5. Massive stars live shorter lives than the common small stars because even though they have a larger amount of hydrogen for nuclear reactions, their rate of consuming their fuel is very much greater.