What is the primary language spoken in Japan?

What is the dominant climate zone of the Amazon rainforest? What is the name of the climate zone that covers the majority of the Sahara Desert? What is the dominant climate zone of the Gobi Desert? What is the main characteristic of the Mediterranean biome? What is the main language spoken in Brazil? What language is most widely spoken in India? What is the primary language spoken in Greece? What is the main language spoken in Norway?