The sun is the main source of energy on earth simply because of food webs/chains and trophic levels. At the bottom of every food chain there is a primary producer, and these producers are almost always photosynthetic--meaning that they use light energy to synthesize sugars and other organic compounds. The next level on the food chain are the primary consumers (those that eat the primary producers), from there secondary consumers, tertiary consumers, quaternary consumers, etc. The important thing to remember though is that all energy comes from the primary consumers, the photosynthetic organisms. For an example: if you think of the primary producers as grass, than the primary consumers would be field crickets. The crickets eat the grass, the mice eat the crickets, the snake eats the mice the hawk eats the snake. But because every organism above the primary producer needs to obtain energy to survive that means that all the organisms rely on the primary producer; which itself relies on the sun for energy.
Some bacteria, known as autotrophs, make their own food and are known as producers. Others, known as heterotrophs, feed off of other organisms and need an energy source.
Trophic Level
Photoautotrophs use light as the energy source for producing proteins, lipids and other organic substances. Examples of photoautotrophs are plants.
1) Oceans have living organisms, and2) Oceans cover about 2/3 of the surface of planet Earth.
The autotrophs have the ability to manufacture their own food from the inorganic raw materials. They extract them from the outside source. They reside on the inorganic medium and require an external source of energy. They are known as producers and include the plants mainly. The heterotrophs do not have the ability to manufacture their own food from the inorganic raw materials. They extract the organic nutrients from the outside source. They reside seldom on the organic medium and do not require an external source of energy. They are known as consumers and include the animals mainly.
radiation
There are several earth created pure energy sources. The most well known include solar energy, hydroelectricity, wave power, wind energy, and geothermal energy.
Consumers ^_^
Some bacteria, known as autotrophs, make their own food and are known as producers. Others, known as heterotrophs, feed off of other organisms and need an energy source.
Apart form Geothermal energy (heat from the core of the Earth) and Tidal energy (from the Earth's spin) all energy comes from the Sun which grew the organisms that form fossil fuels, drives the wind and rain and feeds plants. Sunlight is free!
Yes.
solar energy
Prokaryots
The energy that reaches the Earth from the sun is known as sunlight.
Trophic Level
Organisms
well earth