Continetal drift is land masses that mover over the surface of the earth.. for example a land mass might move from an equatrioal region of the earth and then to an antarctic region so therefore it recives an antarctic climate instead of a equatrial one....
Answer:
only 30% of total energy will be useful ..
So, Useful energy =

13.5J energy is useful
I don't know maybe it is a white blood cell
They are paired, placed in launae and have canaliculi to receive and send nutritive materials to matrix.
Plant-like protists get there food from photosynthesis, which is the process of converting sunlight into energy.