Que es la estabilidad de atomos??

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

Which type of fossil does this image depict?