Approximately what fraction of the universe's total normal mass consists of the complex ingredients necessary for life (elements heavier than Hydrogen and Helium)?

Answer

About one percent

The text notes that the necessary heavy elements required for complex life are relatively rare, making up only about one percent of the universe's total normal mass.

Approximately what fraction of the universe's total normal mass consists of the complex ingredients necessary for life (elements heavier than Hydrogen and Helium)?

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