El sulfato de bario (BaSO4) se obtiene tratando sulfuro de bario (BaS) con sulfato de sodio (Na2SO4). Calcula la cantidad de sulfuro de sodio que se obtiene con 238 g de sulfato de sodio si el rendimiento es del 59%.

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.

The answer is the third choice

C. a pottery art studio

The image seems to be behind the mirror, but nothing is really there.just took the test.