Which of the following choices determine the reactivity of an element? choose all that apply
a. the color of the element
b. whether the symbol of the element is one or two letters
c. the number of electrons are in the valence shell
d. the number of neutrons in the nucleus

1. any body of surface water in which water is stored is a(n) aquifer reservoir channel floodplain 2.which of the following is a source of groundwater replenishment? seepage into springs infiltration from the surface evaporation all of the above 3. watersheds are bounded by points of high elevation called drainage basins. true false 4.non-native species can harm watershed environments by competing with native species for food. true false