What is the name of the primary muscle involved in human breathing?
a. the diaphragm
b. the internal intercostals
c. the external intercostals
d. the abdominal wall muscles
Answer: a. the diaphragm
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The above figure demonstrates
a. imprinting behavior. b. displaying instinctive behavior. c. feeding a social parasite. d. a learned behavior. e. all of these.
What is one way in which the cardiovascular system of a mammal is different than that of an arthropod such as an insect?
A) The heart of the mammal pumps blood into arteries, while the insect heart does not. B) Veins send blood to a mammal's lungs, while insect veins send blood to the heart. C) A mammal's blood is always contained inside vessels, while an insect's blood sometimes leaves the vessels. D) A mammal has a heart to pump blood, while an insect does not have a heart.
To estimate a difference-in-differences it requires that one has a:
A. time series. B. cross-sectional data set. C. selected sample. D. panel data set.
Which of the following is not true of bacterial plasmids?
A. They are required for host growth and/or reproduction. B. They can replicate independently of the chromosome. C. They may carry genes that enhance survival of the bacterium under certain conditions. D. They may carry genes for drug resistance.