Question

1. Which is a substance that cannot be broken down into another substance?

O compound
O atom
O element
O
molecule

Answer 1

Step-by-step explanation:

1. Compound

Answer 2

Atom

Step-by-step explanation:

my theory:

Atoms are their own substance. It's atom because if you tried to break an atom, you would be going into nuclear physics. That would be unsafe and dangerous.