Which of the following are valid research designs?
a. Experiential and factual
b. Epidemiological and factual
c. Epidemiological and causal
d. Epidemiological and clinical trial
d
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If there is an increase in input and output, productivity will :
a. increase b. remain constant c. decrease d. modulate
Lead in water is especially damaging to ____, in whom it can cause ____ damage
a. the elderly; bone b. teenagers; hearing c. children; neurologic d. the elderly; epidermal e. adolescents; reproductive
Invisible or "hidden" fats are ones that are translucent at room temperature
Indicate whether the statement is true or false
Which of the following statements is true?
A. In children, vitamin A deficiency is called rickets. B. Retinol is found only in plant foods. C. Vitamin A is necessary for normal blood clotting. D. Certain carotenoids are precursors for preformed vitamin A.