Final answer:
An entity is composed of atoms, and in broader terms, can also be seen as a combination of systems or parts that function together as a whole. Atoms combine to form compounds with unique properties, and larger entities, like galaxies, are made up of smaller constituent parts.
Step-by-step explanation:
An entity can be composed of various parts depending on the context in which the term entity is used. However, considering the scientific context provided, an entity such as matter is usually composed of atoms, which are the fundamental building blocks of matter. Atoms themselves consist of subatomic particles like protons, neutrons, and electrons. Atoms of the same element are identical and combine in specific whole-number ratios to form compounds, each with its own unique composition and properties.
In the case of living organisms like humans, an entity may be viewed as being composed of multiple systems that work together. For example, humans can be considered to be composed of a physical body, a mind, and perhaps a spirit, all of which function in unison. Likewise, a governmental entity may comprise separate branches such as the legislative, executive, and judicial branches. Molecules such as glucose, which is a compound found in the human body, are always made up of the same proportion of carbon, hydrogen, and oxygen atoms. On a larger scale, entities in the universe, like galaxies and solar systems, are each composed of smaller parts that together constitute the whole.