Answer: Antibiotics: 1929. ...
Tissue culture: 1949. ...
Risks of smoking: 1950. ...
Antipsychotics: 1952. ...
DNA: 1953. ...
Immunology: 1958. ...
Oral rehydration therapy: 1960s–1970s.
Explanation:
It’s the caste system. It’s deep roots are so important it still exists today.
Portuguese, it was 1431 while en route to the indies
A shift in aggregate demand can cause an economic expansion and over time the effect on the expected price level is rising and shifting aggregate supply to the left. Hence, the correct option is (D).
<h3>What is Aggregate Demand?</h3>
Aggregate demand is a measurement of the demand that occurs for a product or service in a nation. The measure used in aggregate demand is money. Therefore, aggregate demand will show the amount of money spent by consumers on a good or service at a certain price level. Aggregate demand measured over a long period of time will also reflect gross domestic product (GDP).
Learn more about aggregate demand at brainly.com/question/1490249
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