Which of the following equals one atomic mass unit? a. the mass of one electron b. the mass of one helium-4 atom c. the mass of one carbon-12 atom d. one-twelfth the mass of one carbon-12 atom

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.