Which of the following can you determine from mass spectrometry data?
A. Different isotopes of an element
B. Density of an element
C. Energy levels of an atom
D. Number of Particles in a sample

Which of the following practices is not recommended during a time of water scarcity? a. increasing wastewater recycling b. prohibiting the consumption of bottled water c. raising fines for violating outdoor water restrictions d. improving monitoring and management of local aquifers e. utilizing media to promote awareness of best practices in water management