I actually don’t know but good question
Answer:
I think it is AM and frequency
Explanation:
Sorry if i'm wrong ;)
Answer:
the cells in your body
Explanation:
Most people that i have asked this similar question to, have said the sun. It's not the sun because the sun disappears at night. Your body produces heat because your cells are burning up energy.
Answer:
OXYGEN
I don't know what to say for the 20 character limit
When you calculate the first two numbers in 493×10