Answer the following questions with a picture only PLEAS. 1. What is the main source of energy for ecosystems?

2. What are some natural things that can disturb ecosystems?

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.