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.
Answer:
No dinosaur fossils are found above the Cretaceous Paleogene boundary.
Explanation:
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Your question: Which part of the ocean floor is part of the continuous underwater mountain range that circles earth?
Your answer: Mid- ocean ridge is the part of the continuous underwater mountain range that circles earth.
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Answer:
Widely regarded as an economic miracle, China embraced widespread centralized economic reforms, averaging a GDP growth of 10% annually and lifting half of its 1.3 billion people out of poverty. China is projected to surpass the United States as the world's largest economy in the next decade.
