Complete the sentence. Select all that apply. The use of the term "energy levels" in the text implies: s, p, d, f
a quantized amount of energy found at the different levels
n = 1, 2, 3, ...
orbitals
groups

According to the passage, which of these is true about gray water systems? a) gray water systems use plants that require less water. eliminate b) gray water systems require the use of less fossil fuels. c) gray water systems reduce the amount of fresh water used. d) gray water systems reduce the amount water used by shower heads.