Scientists can't be sure about the early atmosphere and can only draw evidence from other sources. For example, volcanoes release high quantities of carbon dioxide. Iron-based compounds are present in very old rocks that could only have formed if there was little or no oxygen at the time.
Answer:
An open circuit is one where the continuity has been broken by an interruption in the path for current to flow. A closed circuit is one that is complete, with good continuity throughout.
Explanation:
For instance, a simple light switch opens and closes the circuit that connects a light to a power source. When you build a circuit, it's a good idea to disconnect the battery or other power source when the circuit is not in use.
Answer:
The answer is below
Explanation:
Cultural diffusion occurred in Mesoamerica even when the Olmec, Maya, and Aztec didn't rule at the same time as a result of certain occurrences:
The Mesoamerican cultures through the years tried to dominate one another. Thereby, this led to the conquering of neighboring nations which result in the conquered nation being greatly influenced by the cultures of the dominant nation.
For example, the Olmec were the earliest dominant nation, and their culture transcends to other neighboring nations that they conquered such as Mayans. The Olmec cultures were reflected through the rise of Mayan cultures, most especially in terms of architecture, knowledge, and religion.
Similarly, Aztecs were initially dominated by Toltecs and thereby got influenced culturally. The Toltec culture was later reflected in Aztec culture.
