An organ is the heart, muscles, gallbladder, kidneys, lungs, and stomach and they are called internal organs. An organ is made of a collection of tissues that make a structural unit. Hope it helps!
Answer:
A
Explanation:
In chemistry, a mixture is a material made up of two or more different substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions, and colloids.
The answer is same atomic number!
