They are about 4.5 billion years old. Hope this helps.
Answer:
B. Cell Type
Explanation:
that is the answer i believe
It is called Mass.
Among the physical characteristics of a matter which includes Weight, Mass, Volume, and Density the only characteristic that does not change is the mass. The mass of an object never change from place to place. All the objects have a mass and that is why there is a weight but it changes depends on the gravity. Mass don't.
