Each element absorbs light at specific wavelengths unique to that atom. When astronomers look at an object's spectrum, they can determine its composition based on these wavelengths. The most common method astronomers use to determine the composition of stars, planets, and other objects is spectroscopy.
I would say "A"
Answer
Homologous structures that, because of their similarity, suggest a connection with a common ancestor.
An element is made up of only one type of atom.
Answer:
increasing number of neutrons from left to right
Energy flows through a one-way stream.
Energy is transferred by organisms eating.
