If the patient has to be administered with a dosage of 2 tablets for every 2 hours for 7 days, what would be the number of tablets required for the prescribed dosage?

The answer is d- principle of faunal succession.

The phase where ice changes directly to gas is called sublimation 

In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.

I'm pretty sure the answer is alcohol