Answer:
The greenhouse effect is a natural process that warms the Earth's surface.
Explanation:
When the Sun's energy reaches the Earth's atmosphere, some of it is reflected back to space and the rest is absorbed and re-radiated by greenhouse gases. Greenhouse gases are absorbed energy that warms the atmosphere and the surface of the Earth.
The Mayan and other Mesoamerican cultures used a vigesimal number system based on base 20 (and, to some extent, base 5), probably originally developed from counting on fingers and toes. The numerals consisted of only three symbols: zero, represented as a shell shape; one, a dot; and five, a bar.
The answer is for the question is
Answer A
