Scientists in a Central American country are studying fact…
Scientists in a Central American country are studying factors that may be associated with delayed physical growth among a group of children. The children live in a region of the nation that has high levels of lead in drinking water. This study is an example of a(an) _________blank study.
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Which word should fill in the blanks? ……………………………….are chemical substances in food required by the body to perform its basic functions. Most ……………………………must be obtained from our diet since the human body does not synthesize or produce them.
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