( ( ( ( Calcium ( and ( Magnesium Calcium ) ) ) and ) magnesium ) ( ( are ( ( macronutrient elements ) ( in ( biological tissues ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Calcium) (CC and) (NNP Magnesium) (NNP Calcium)) (CC and) (NP (NN magnesium))) (VP (VBP are) (NP (NP (JJ macronutrient) (NNS elements)) (PP (IN in) (NP (JJ biological) (NNS tissues))))) (. .)))
Calcium and Magnesium Calcium and magnesium are macronutrient elements in biological tissues.
(ROOT (S (NP (NNP Potassium) (, ,) (NNP calcium) (, ,) (CC and) (NNP magnesium)) (VP (VBP are) (VP (VBN considered) (NP (NNS macronutrients)))) (. .)))