Yes it is absolutely true that each lung is fed oxygen by a separate bronchus. There are actually two lungs and two bronchi. Each of the two lungs are safeguarded by the two ribcages as
they are placed within the rib cages. The lungs actually consists of elastic
sacs that contract and expand for taking in and releasing air. This way oxygen
is passed into the blood and carbon dioxide is taken out from the blood and
passed out. This is also the main function of the lungs.
Did you mean limestone? if so, then yes. limestone is a sedimentary rock.
Condensation and hydrolysis are changes which a solid can undergo to change the phase or identity. Condensation is a phase change that changes vapor to liquid. Hydrolysis on the other hand is the reaction with water that results in the breaking of chemical bonds
