Contents of the digestive system are moved along by rhythmic contractions and relaxations of smooth muscle. This process is called _________
Fill in the blank(s) with the appropriate word(s)
Answer: Peristalsis
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The population most likely to be affected by catheter-associated urinary tract infections is
A. women who have recently delivered a baby by caesarean section. B. women who abuse intravenous drugs. C. urban sex workers. D. elderly women in a nursing home.
What limits the size of a cell?
a. lack of building materials b. the size of the organism c. the relationship between the volume of the cell and its surface area d. the job it does e. the materials it has to exchange
Water covers about ______ percent of the Earth's surface.
A. 33 B. 40 C. 50 D. 70 E. 80
In this experiment, Balanus was removed from the habitat shown on the left. Which of the following statements is a valid conclusion of this experiment?
a) Balanus can survive only in the lower intertidal zone because it is unable to resist desiccation. b) Balanus is inferior to Chthamalus in competing for space on rocks lower in the intertidal zone. c) The two species of barnacles do not compete with each other because they feed at different times of day. d) The removal of Balanus shows that the realized niche of Chthamalus is smaller than its fundamental niche.