The answer is D, species!
Hope this helps!
Uh no I can’t help but, I hope you have a good day!
What your question for number 3
Explanation:
when an iron bar rust is an example of a chemical change in which a new substance is formed and the change is not easily reversible.for iron to rust moisture and air must be present.while when a substance freezes,it can be easily reversed through melting and no new substance is formed.this change is termed a physical change.
