The type of electromagnetic wave used for warming, photosynthesis in plants, and making vitamin D in humans is the UV (ultraviolet) wave.
The other options break down as follows:
- Gamma rays: High-energy waves used in medical treatments and imaging, not for warming or photosynthesis.
- Visible light waves: Important for photosynthesis, but not specifically for warming or vitamin D production.
- Radio waves: Used for communication technologies, not relevant for the processes mentioned.
So, the correct answer is UV wave.