A hIghly energetic object or substance
no it does not require energy.
endothermic reactions require energy
All of your cells require energy. Without energy you wouldn't be alive.
thinking, dreaming require energy
All living organisms (not dead) require energy
No, it does not require energy use from the cell.
Yes, require to spend energy
All living organisms (not dead) require energy
Radiation, or electromagnetic waves do not require matter to carry energy.
Water flowing downhill does not require energy, only the force of gravity.
Yes, they require a biofuel
They require less energy as they do not do much work compared to teenagers. They should have less energy intake and less energy expenditure.