19. Which statement best describes the reaction taking place in the core of a star during its main sequence stage? a. Decay of carbon-14 to carbon-12
b. Fusion of hydrogen into helium
c. Fission of helium into hydrogen
d. Fusion of hydrogen into water vapor

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.