A green box contains a blue box and a pink box. the blue box contains 2 h subscript 2 o. an arrow then leads in the green box to the pink box, which says 2 h subscript 2 o subscript 2. lines lead from labels to parts of the boxes. label a leads to the beginning of the green box. label b leads to the blue box. label c leads to the arrow. label d leads to the end of the pink box. identify each part of this chemical equation, which describes the breakdown of water into hydrogen and oxygen. a (the entire green box): b (the blue box): c (the arrow): d (the purple box):