I think it is d - as plants animals and insects etc all do this
Carbon compounds regulate the Earth's temperature, make up the food that sustains us, and provide energy that fuels our global economy. Most of Earth's carbon is stored in rocks and sediments. The rest is located in the ocean, atmosphere, and in living organisms. These are the reservoirs through which carbon cycles.
Mexico's CBR started later than Sweden's.
C. Pepsin is the hormone that is produced mainly in the stomach and regulates secretions of gastric juice.
