Question

nucleosynthesis in stars (due midnight 10/27)

• elements created during the big bang: hydrogen and a little helium were formed in the first few minutes after the big bang. this process is called \big bang nucleosynthesis\.
• elements created through nucleosynthesis in stars: on the periodic table, the elements helium all the way up to iron are formed in the cores of stars as they undergo nuclear fusion. as stars age they produce heavier and heavier elements.this process is called \stellar nucleosynthesis\. remember, the word \stellar\ refers to stars, so these elements are formed in the core of stars as they go through the process of nuclear fusion.
• elements created in supernova explosions: all elements heavier than iron (26) all the way up to plutonium (94) are produced in the extreme conditions of supernova explosions as massive stars die. this process is called \supernova nucleosynthesis\

as stars age, they produce elements that are
heavier and heavier
heavier then lighter
lighter and lighter

Explanation:

The text clearly states "As stars age they produce heavier and heavier elements".

Answer:

Heavier and Heavier