If you are lacking energy then it likely stems from a problem that cannot be solved by taking a pill or supplement. All foods contain energy in differing amounts, those with the most fat are generally the highest, but if you are experiencing lethargy, it is likely to be due to a hormonal problem in your body, and not through lack of energy intake.
To ensure you have sufficient energy, make sure you get enough sleep, are not eating/drinking high GI foods causing sugar crashes, and are not under too much stress.
If you are constantly fatigued then it is advisable to consult your doctor.
If you mean "we humans" - we take in energy by the food we eat. That food contains chemical energy.
Energy has many forms. The energy that is stored in the position or the structure of an object is called potential energy . There are many forms that potential energy can take. Chemical potential energy , elastic potential energy, and gravitational potential energy.
light energy
Bacteria a re decomposers. They take energy from dead animals.
Electric motors take electric energy and turn it into kinetic energy Generators take mechanical energy and turn it into electric energy
It takes the energy of heat.
they stick their snouts in and take the energy
they use the sun as energy which is their sugar and food.
Which energy?
Producer get their energy by the nutrients and the sun it gets.
Crystals do not give energy!
They obtain energy in much the same way as people do. They take organic matter called detritus, and take the chemical potential energy out of it.