What causes nervousness is a chemical called ( )
举一反三
- A chemical causes nervousness is called adrenaline.
- The chemical bond that causes silicon atoms to combine into crystals is called an ioninc bond
- A chemical compound that contains two atoms of oxygen and one atom of another chemical element is called ______
- What are the causes of deforestation?
- Watch the video clip "The Five Causes of Disease", answer what are these five causes?