For our convenience, we have given it the name lemon, not for the sake of understanding the basic reality of atoms and molecules. This is a body with various systems of blood, food, etc., in it. It is alive only as long as all these systems are functional. It becomes a dead body the moment these systems stop functioning. The body is dead, but the cells and atoms are still there.
Atoms get back to atoms.
When hydrogen and oxygen combine, we get water and we can drink it. For convenience, we postulate such variety. It is neither truth nor untruth but an appearance of the non-existent as real. Such appearances are temporary and transient and change their form after some time. Truth is unchanging.