Teotihuacan is an ancient American city and currently an archeological site in Mexico, close to Mexico City.
The city was ancient even to the Aztecs who, like us, only saw the ruins of the city (the name was given by the Aztecs and we don't know what the original inhabitants of the site called it).
The Answer is A. It was a Arms race like who could develop what quicker
The answer is the ocean-continental convergence. This is where the gold of the Inca civilization come from.
starting billions of years ago Algae converted carbon dioxide to oxygen the algae change the atmosphere of the earth.
A layer (or layers) of gases that surround a planet and are kept in place by the gravity of the planetary body is known as an atmosphere.
It is sometimes referred to as a "sphere," "vapor," or "steam." When the atmosphere's temperature is low and its gravity is strong, a planet can maintain its atmosphere.
The outer part of a star, including the layers above the opaque photosphere, is known as the stellar atmosphere; low-temperature stars may have outer atmospheres with complex molecules.
A whirling disc of gases that compressed against itself and split into a number of evenly spaced rings of gas and matter gave rise to the planets' first atmospheres, which eventually condensed to create the Solar System's planets.
Learn more about the atmosphere here
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