Answer:
A 1. The sun is the only star in our solar system.
C 3. The sun is made mainly/mostly of hydrogen and helium.
Step-by-step explanation:
1. Each solar system has a star, but ours only has one, the sun.
2. The Sun Is made mainly of hydrogen and helium. The sun is 72% hydrogen. Helium makes up 26 percent, Which equals 98 percent of the sun. The other 2 percent is made up of multiple other elements.