Answer:
Most stars are rather simple things. They come in a variety of sizes and temperatures, but the great majority can be characterized by just two parameters: their mass and their age. (Chemical composition also has some effect, but not enough to change the overall picture of what we will be discussing here. All stars are about three-quarters hydrogen and one-quarter helium when they are born.)
It is a column of elements in the periodic table of the chemical elements.
A factor that is changed in an experiment is called the Independent Variable.
Answer:
synthesis
Explanation:
I believe answer is d a synthesis reaction
