Observational studies are based on making observations on subjects without manipulating them. As such, it is hard for observational studies to ________.

A. generate any results
B. test participants
C. find proper funding because they are expensive
D. draw conclusions about the cause of an observation


Answer: D

Biology & Microbiology

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Which statement about the internal biological clock is false?

a. It is known as a circadian rhythm. b. It relates to the opening and closing of stomata. c. It includes the sleep movements observed in some plants, such as beans. d. It may involve both phytochrome and cryptochrome. e. It disappears totally if it is not reset by the rising and setting sun.

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