una pieza de hierro contiene 72.3% de hierro y 27.7% de oxigeno con una masa molar de 231.4 g/mol ¿Cuál es su formula molecular?

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.