Lately, many claims concerning the health benefits of green tea have appeared in the news. Suppose you read a claim that says drinking green tea causes weight loss
The information provided states that participants were weighed at the beginning of the study, were then asked to drink 2 cups of green tea every day for 6 weeks, and finally were weighed at the end of the study. Participants who drank the tea for 6 weeks seemed to have lost some weight by the end of the study, so the researchers concluded that green tea is helpful for weight loss. This study has some obvious holes in it. Explain three things that could be done to improve the design of this study. Do not assume any information other that what has been provided.
The student can suggest that a control group be used and/or that placebos be used. Also, the study could be double-blind.
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There are exceptions to the general rule that amphibians lay eggs that develop in the water. These exceptions showed extreme variation but they do have one thing in common. What is it?
A. They all develop in some sort of pouch. B. They all develop in desert environments. C. They all develop in habitats with adequate humidity. D. They all develop in a camouflaged environment. E. They all develop more slowly than eggs developed in water.
In the pressure-flow model of phloem transport, the sink is normally
A. the stem. B. lenticels. C. xylem. D. the roots.
To include your eyes and ears in the same section, you would need to cut your body in which plane?
a. median b. frontal c. sagittal d. transverse e. cephali
A vein always carries:a
blood to the heart. b. blood from the heart. c. oxygen-rich blood. d. oxygen-poor blood. e. blood rich in carbon dioxide.