Please help I am time What major concept did the Maya contribute to the field of mathematics? calculating the speed of light
introducing zero as a placeholder
inventing algebra
O creating the system of numbers most used today

Which phrase describes one of the reforms the national convention made up to improve the lives of ordinary french people

How are diamonds and graphite the same? how are they different? a. both diamonds and graphite are made entirely out of carbon. they are different because the carbon atoms are arranged differently with a more three-dimensional structure in diamonds and flat layers in graphite. b. both diamonds and graphite have atoms that are arranged with flat layers. they are different because only graphite are made entirely out of carbon. c. both diamonds and graphite have atoms that are arranged with three-dimensional structures. they are different because only diamonds are made entirely out of carbon. d. diamonds and graphite have no similarities. they are different because the carbon atoms are arranged differently with a more three-dimensional structure in diamonds and flat layers in graphite.

During the cold war, the united states was involved in certain regional conflicts due to fears later called the domino theory, which stated which concept?