( ( When ( ( the mother ) ( lays ( her egg ) ) ) ) ( , ( ( the embryo ) ( ( has ( ( developed ( the ( same amount ) ) ) ( as ( a ( newborn marsupial ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT the) (NN mother)) (VP (VBZ lays) (NP (PRP$ her) (NN egg))))) (, ,) (NP (DT the) (NN embryo)) (VP (VBZ has) (VP (VBN developed) (NP (DT the) (JJ same) (NN amount)) (PP (IN as) (NP (DT a) (JJ newborn) (NN marsupial))))) (. .)))
When the mother lays her egg, the embryo has developed the same amount as a newborn marsupial.
(ROOT (S (NP (PRP You)) (VP (VBP call) (SBAR (WHNP (DT an) (NN animal) (WHPP (IN in) (WHNP (WDT which)))) (S (NP (NP (DT the) (NN embryo)) (, ,) (VP (ADVP (RB often)) (VBN termed) (NP (DT a) (NN joey))) (, ,)) (VP (VP (VBZ is) (VP (VBN born) (S (ADJP (JJ immature))))) (CC and) (VP (MD must) (VP (VB complete) (NP (PRP$ its) (NN development)) (PP (IN outside) (NP (NP (DT the) (NN mother) (POS 's)) (NN body))))) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN marsupial)))))) (. .)))