There are many of them but the most common are:
1.) Photosynthesis
2.) Solar Energy
3.)Thermochemical Reactions
<em><u>Answer:</u></em>
<em><u> The cost of the Great War ( World War I) in Europe was the needless loss of nearly an entire generation of young men, but in many regards, the social conventions of the time, exemplified in the infamous, government concocted "Little Mother" letter, required women to accept their losses quietly.</u></em>
<u><em>Explanation:</em></u>
The ancient Greeks came up with the idea of representation for the people. Although it is not like our modern ideas of equal representation for all, democracy still holds its roots in ancient Greece.
