Adenosine-5'-triphosphate (ATP)
light energy
The next available energy source to the cell following carbohydrate depletion is protein.
No you do not.
when an organism uses most of it's carbohydrates, it can get energy from these lipids
Yes.
to use energy
yes it has too in order to survive.
by smd
atp
Living organisms use food for energy. Without energy, no living organism can do anything.
We were not on the distribution list for the results of the tests, so we have no way to know what foods were tested. The easiest way to get a quick burst of energy is probably a combination of caffeine, sugar, and fear.
Unicellular organisms do not use energy for everything. For instance, diffusion across the cell membrane of the organism does not require the use of energy.