When a mass of hydrogen has enough density, it begins to fuse the hydrogen atoms together. This fusion process creates large amounts of heat and light. When a mass of hydrogen begins the fusion process, it is classified as a —
star
nebula
galaxy
planet

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

here is your answer hope i .

if you know your abc's you should be able to get your answer or just use google