A
It is the basic unit of matter.
What is an atom?
It is the hardest natural substance on Earth.
What is a diamond?
It is the force that pulls everything toward the center of the Earth.
What is gravity?
He proposed the Law of Motion.
Who is Isaac Newton?
It is the largest internal organ in the human body.
What is the liver?
It is the largest planet in our Solar System.
What is Jupiter?