These images of the santa cruz river in arizona were taken in 1942 and 1989. during the period between these years, the growth of vegetation declined substantially in the area. what are the two most likely explanations for this change in vegetation

The roots could no longer access depleted groundwater.

The topsoil in the area eroded.

The roots could no longer access depleted groundwater.

The topsoil in the area eroded.

THIS IS CORRECT

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.

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >