( ( ( Refrigeration and ) freezing ) ( ( are ( two ( of ( ( the ( most ( common forms ) ) ) ( of ( ( food preservation ) ( used today ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Refrigeration) (CC and) (NN freezing)) (VP (VBP are) (NP (NP (CD two)) (PP (IN of) (NP (NP (DT the) (RBS most) (JJ common) (NNS forms)) (PP (IN of) (NP (NP (NN food) (NN preservation)) (VP (VBN used) (NP (NN today))))))))) (. .)))
Refrigeration and freezing are two of the most common forms of food preservation used today.
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (DT the) (NN earth) (POS 's)) (NN freshwater)))) (VP (VBZ is) (PP (IN in) (NP (NP (DT the) (NN form)) (PP (IN of) (ADJP (JJ frozen)))))) (. .)))