( ( ( Human and ) animal ) ( ( viruses ( as ( biological entities ) ) ) . ) )
(ROOT (S (NP (NP (NNP Human)) (CC and) (NP (NN animal))) (VP (VBZ viruses) (PP (IN as) (NP (JJ biological) (NNS entities)))) (. .)))
Human and animal viruses as biological entities.
(ROOT (S (NP (NNS Viruses)) (VP (VBP are) (NP (NP (DT the) (ADJP (RBS most) (JJ abundant)) (NN type)) (PP (IN of) (NP (NP (JJ biological) (NN entity)) (PP (IN on) (NP (DT the) (NN earth))))))) (. .)))