Bread and carbohydrates are the main sorce of energy
carbohydrates
fat
it would be the top consumers due to the fact they eat 1 animal that has eaten another that has eaten another and so on.
food
The sun.
"Octanol is not the most energy efficient fuel. Butanol is. Octanol gives out 8691.34J of energy per gram. Butanol gives out 15521.21J of energy per gram" Please state your source.
Woodway Treadmills claim to be the most energy efficient.
In recent years, LG appliances have been made to be energy efficient. LG claims that it's third generation refrigerator compressor is the most energy efficient in the world.
food
sugars
LEDs are the most energy-efficient lights as of 2016.
Bread and carbohydrates are the main sorce of energy
Wind energy is one of the most eco friendly energy source but is not as efficient as others
The sun.
herbivores
Yes fats are the most calorific energy source.
parasites
Not really because the intense gravity field prevents most of the energy escaping.
In most food webs the Sun is the ultimate source of energy. Some food webs start with chemotrophs and in those cases the source of the energy are chemicals often from underwater volcanoes.
The most efficient users of solar energy in a food chain are herbivores. Instead of eating animals that eat plants that require the sun to grow, they simply eat the plants.