Question

1. choose all that apply. what are two characteristics of stars? they are mostly composed of nitrogen and oxygen. nuclear fusion causes stars to glow and give off light. most stars are made out of the elements hydrogen and helium. nuclear fusion creates carbon.

Explanation:

1. Analyze each option:

• Option 1: Stars are mostly composed of hydrogen and helium, not nitrogen and oxygen. So this is incorrect.
• Option 2: Nuclear fusion in stars (converting hydrogen to helium, and later heavier elements) releases energy, making stars glow and emit light. This is correct.
• Option 3: Most stars are primarily made of hydrogen and helium. This is correct.
• Option 4: Nuclear fusion in stars mainly produces helium (and later heavier elements like carbon in later stages, but "creates carbon" is not a defining characteristic of all stars initially). So this is less accurate as a general characteristic.

1. So the correct options are the second (Nuclear fusion causes stars to glow and give off light) and third (Most stars are made out of the elements hydrogen and helium) options.

Answer:

• The option "Nuclear fusion causes stars to glow and give off light"
• The option "Most stars are made out of the elements hydrogen and helium"