Answer:
It's one time or maybe ttwo
Carbohydrates, lipids, and nucleic acids
hope this helps :)
Answer:
true
terrestrial planets
true
true
true
false
I am not sure about the last one
This is not a biology question this is a math question
Try to keep your skin mosturized as much as you can, but in general you can't really prevent it because its just dead skin. it happens to everyone.