Answer:
The answer to your question is: The distance traveled by light in one year.
Explanation:
A light year is a unit of distance.
The thermosphere has no definite outer limit.. it’s the almost the outermost layer :)
Answer:
A. Atom :- a substance that cannot be broken down into a simpler substance.
Explanation:
Atom is a basic unit of any chemical substance or element. It cannot be broken into simpler material. Although it is known that an atom is made up of electron proton and neutron but these are not simpler substances. In an atom electron is negatively charged and proton is positively, while neutron is neutral.
