It seems we lack enzymes that are capable of breaking down cellulose.
Cause we're humans! Duuh!!
In the human diet, the main source of energy is carbohydrates. In order to be used, carbohydrates are broken down into glucose that is used during respiration to produce energy.
Sunlight is the primary source of energy for humans and all other living things. Also, glucose is a main source of energy (eating).
the appendix digest cellulose, but human appendix does not work.
Paper has cellulose fiber but human body can't digest cellulose fiber.
Adenosine triphosphate. It's the only source of energy for the human body.
Cellulose
Currently, human's conventional source of energy is fossil fuel.
in makes ATP for your boty. ATP is sugar so it will gev you energy to you can do things.
Energy source
Energy
no , technically no human { animals} is an energy source on earth
The human hand
Source of energy
Human cells
Carbohydrates
carbohydrates
Carbohydrates