What did the Mayans develop

astronomy, calendar system, and hieroglyphic writing

Explanation:

The Ancient Mayans developed the science of astronomy, calendar systems, and hieroglyphic writing. They were also known for creating elaborate ceremonial architecture, such as pyramids, temples, palaces, and observatories. These structures were all built without metal tools

Explanation:

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question - in the 1900s there were two competing views about the environment that often pitted industrialist and conservationist against one another. how were these two competing views demonstrated by the environmental policies of president roosevelt and president taft?

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ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.