The roots of plants are important to photosynthesis because a. provide the water needed. b. provide the carbon dioxide needed. c. remove glucose from the plant. d. remove oxygen from the plant.

provide the water needed (a)

Explanation:

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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante