Answer: d all of the above
Explanation: All of these problems existed, and indeed still exist to a certain degree, in the early 2000s.
Hope this helps! :)
The Mayans<span> evolved the only true written system native to the Americas and were masters of mathematics and engineering. The </span>Maya writing<span> system (often called hieroglyphics from a vague superficial resemblance to the Egyptian </span>writing<span>, to which it is not related) was a combination of phonetic symbols and ideograms.</span>
A point inside the production possibilities frontier is feasible, but not efficient.
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<u>Explanation:</u></h3>
Production possibility frontier of a country is the point at which a country's economy is most efficient in producing its goods services and therefore allocating and using it's resource at its best possible way.
Production possibility frontier curve shows different combinations or collections of the amount of quantity of two goods which can be produced within the given resources and technology. It explains several economic concepts such as allocating efficiency, economies of scale, opportunity cost, production efficiency and scarcity of resources.
<em>Why are drugs like depressants described as the opposite of amphetamines?</em>
<em>As previously stated, depressants inhibit the central nervous system, while stimulants like amphetamines speed up the body's systems. This is why they are described as being opposite of one another.</em>
