Which of these stars is the oldest? a) nearly 100% hydrogen b) nearly 50% hydrogen c) nearly 0% hydrogen d) nearly 0% iron

Hydrogen plays a very significant part in the existence of stars around nebulae. A vast amount of hydrogen is needed for stars to be born. Hydrogen heats up and ignites due to a chain reaction from the collision of atoms but since there is no gravity acting upon the nebulae, it takes millions of years for the stars to exist.

glycolysis

explanation:

glycolysis must occur before any of the other steps can occur.

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