Question

the energy the sun produces varies depending on the stage of development. this also changes the elements found in the sun. the model shows part of the life cycle of a low - mass star like the sun. how does energy production and the elements present in the star change during the life cycle? place each piece of data into the model next to the correct stage of the life cycle. life cycle stage energy production elements present main sequence star red giant planetary nebula no significant fusion fusion in core fusion outside the core mostly hydrogen and helium mostly hydrogen, helium, oxygen, and carbon mostly hydrogen, helium, oxygen, and carbon

Explanation:

During the main - sequence stage, hydrogen fuses to helium in the core and the star is mostly hydrogen and helium. In the red - giant stage, hydrogen fusion occurs outside the core and elements present are hydrogen, helium, oxygen, and carbon. In the planetary - nebula stage, there is no significant fusion and the elements are hydrogen, helium, oxygen, and carbon.

Answer:

Main sequence star - Energy Production: Fusion in core; Elements Present: Mostly hydrogen and helium
Red giant - Energy Production: Fusion outside the core; Elements Present: Mostly hydrogen, helium, oxygen, and carbon
Planetary nebula - Energy Production: No significant fusion; Elements Present: Mostly hydrogen, helium, oxygen, and carbon