Questions

Para-amino salicylic acid (PAS) is used in the treatment of Tuberculosis.

Online campaigns are highly measurable and may be able to generate an automatic positive ROI. As long as ROI remains positive, it can be strategic to capture all traffic without a predetermined budget.

In chemistry rusting is called as oxidation. Oxidation is a chemical process where metal gains oxygen and become oxide. In rusting the Iron ore make a chemical reaction with the oxygen in the presence of water and environmental or atmospheric moisture to produce an Iron oxide. Iron oxide is otherwise called as rust.

The rusting of iron is a chemical change because it is two substances reacting together to make a new substance. 

Rusting would only be a physical change if iron molecules remained pure iron throughout the process.

Sir Jack Brabham

Any of the above given options can be a reason for the damage of the relationship of a couple or a two families or two friends etc...

Without trust relationship cannot be maintained, people not spending time with one another or without meeting the expectations of the opponents can also damage the relationship.

Pitot tube is used to measure stagnation pressure.