Answer:
There are four main categories of anesthesia used during surgery and other procedures: general anesthesia, regional anesthesia, sedation (sometimes called "monitored anesthesia care"), and local anesthesia.
Photosynthesis and chemosynthesis
The speed of sound wave is slower than electromagnetic wave.
First they don't use oxygen, plants use the CO2 in the air and release oxygen out into the air after the plant used up the CO2
