The course of a chemical reaction can be traced by using a a) polar molecule b) diatomic molecule c) stable isotope d) radioisotope

D radioisotopes

Explanation: radioactive isotopes are used because they emits radiation. With these radiations, scientists can trace the course of a chemical reaction

explanation:

i think option no d is the correct answer

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.