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.
What will be an ideal response?
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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The three cell types discussed, eukaryotes, archaea, and bacteria, all derived from ________.
A. photosynthetic bacteria B. archaea C. cells with a true nucleus D. the last universal common ancestor
Acid rains have the same effect as
a. use of manufactured fertilizers b. ion exchange. c. denitrification. d. leaching. e. weathering.
Touching your chin to your chest is an example of ____________________. Fill in the blank(s) with the appropriate word(s)
Gas exchange and stomata When water is in short supply, plants _____ their stomata which _____ gas exchange.
a) close, decreases b) open, decreases c) close, increases d) open, increases