A mitochondria holds power/energy. It would be a power house or anything to do with electricity! :) Hope this helped.
The density of the lithosphere varies depending on temperature, depth and age. At about 50 kilometers (30 miles) below the Earth's surface, density measurements reach 200,000 pounds per square inch (13,790 bars). Due to the pressure from the above crust and mantle, lithospheric density generally increases as both age of the surrounding rock and depth increas
we can rule out D immediatley as it makes no since. honestly i think it is C.
The twisted shape of DNA is called Double Helix