An experimental group
A. is the same as the control group.
B. differs from the control group by one variable.
C. differs from the control group by several variables.
D. is not necessary if an experiment contains a control group.
B. differs from the control group by one variable.
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Which layer of the digestive tract houses the blood and lymph vessels into which nutrients are transported?
A. lumen B. mucosa C. submucosa D. longitudinal muscles E. serosa
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the plasma membrane is called
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by the a. loop of Henle. b. glomerulus. c. distal tubule. d. proximal tubule. e. Bowman’s capsule.