The random motion of water molecules causes a net movement of substances from a region of high concentration to a region of low concentration:
A. phagocytosis
B. filtration
C. osmosis
D. diffusion
E. pinocytosis
Osmosis
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Viroids ____
a. are more complex than viruses b. have large DNA genomes c. encode their own polymerase for nucleic acid replication d. cause diseases in plants e. infect animal cells
Which of the following statements about anabolic steroids is false?
A) They cause a general buildup of muscle mass.
B) They often cause the body to reduce its normal output of sex hormones.
C) They promote bone growth.
D) They can stimulate mood swings and violent behavior.
_______ tissue heals rapidly, compared to other tissue types.
Fill in the blank(s) with the appropriate word(s).
In words, why can utilizing an instrumental variable be an effective means toward identifying the causal effect of a treatment on an outcome?
A. It allows you to identify the causal effect of the treatment by using only variation in the treatment that isn't correlated with unobservables that affect the outcome. B. It allows you to identify the causal effect of the treatment by using only variation in the treatment that is correlated with unobservables that affect the outcome. C. It allows you to identify the causal effect of the treatment by controlling for unobservables that may crucially affect the outcome. D. None of the answers is correct.