( ( Humus ( is compost ) ) ( , ( ( the decayed ) ( ( remains ( of ( ( ( ( ( plants , ) ( animal wastes ) ) , ) and ) ( even animals ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (NNS Humus)) (VP (VBZ is) (ADJP (JJ compost)))) (, ,) (NP (DT the) (NN decayed)) (VP (VBZ remains) (PP (IN of) (NP (NP (NNS plants)) (, ,) (NP (NN animal) (NNS wastes)) (, ,) (CC and) (NP (RB even) (NNS animals))))) (. .)))
Humus is compost, the decayed remains of plants, animal wastes, and even animals.
(ROOT (S (NP (NP (DT The) (JJ decayed) (NNS remains)) (PP (IN of) (NP (VBG living) (NNS organisms)))) (VP (VBZ is) (VP (VBN called) (NP (NNS humus)))) (. .)))