Human beings play a key role in the preservation of the Earth?s ecosystems.
Taking care of one´s body through a healthy lifestyle contributes to avoid illness.
Civilizations left a print through migrations and exploring the world.
People have expressed their ideas, values, feelings and cultures through different literary genres.
Planet Earth's living conditions are determined by the interaction with other celestial bodies.
The territorial and economic organizational systems have implications over the rights and responsibilities of the citizens.