The hormone bovine somatotropin (BST) stimulates increased milk production in cows. (True or false?)

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In the mid-1970s, China implemented a policy whereby each couple was limited to one child. They called it the 4-2-1 policy. This means that extended families consisted of four grandparents, two parents, and one child.

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They all invented machinery for agricultural purposes.

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A sewage system receives and treats human waste. To be regarded as safe, a sewage system must decompose human waste and release by-products that are free from harmful chemicals and disease-causing organisms.

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In the undeveloped countries of the world, many engineers, teachers, and technicians have sought simple, tough, reliable machines to improve agriculture. In such countries, the United States highly developed, complex, computerized, and expensive machinery does not work for long. Most countries do not have people trained for the variety of agriculture mechanics jobs that are needed to support U.S. agriculture.