A is may be the correct answer
Answer: B. Metal
Explanation: The catalyst used in the converter is mostly a precious metal such as platinum, palladium and rhodium Hope This Helped (=^･-･^=)
An environmental scientist studies the environment - you can see that in the beginning of the sentence :)
Exothermic.
To remember this, ‘exo’ means outside, and ‘thermic’ means heat. It gives the outside (exo), heat (thermic).
D- If there is a color change that is indicative to that being a chemical change.
A, B, and C are examples of physical changes.
