please help me in ethics

please answer me any of those question ..m confused in it

Q1. Promotion policy based on individual merit and not purely on the basis of seniority is discriminatory?right or wrong explain?

q2. there is no economic growth witout ecological cost?

q3. explain the extent to which it is possible to observe ethical behaviour in marketing .also explain in brief the merits and demerits of above.

These are past years questions...