Can someone tell me what the answer is to all this

Stage in which a typical star has completely stopped fusion

Some familiar products contain some of the same types of atoms. for instance, the chemical formula for baking soda is nahco 3. the chemical formula for liquid bleach is naclo, and the chemical formula for table salt is nacl. which choice best describes why these three products have some of the same types of atoms in common?

One nanometer is equal to how many meters?