In the wild, an animal avoids a food that had previously made it sick. This animal is exhibiting
A. observational learning.
B. habituation.
C. imprinting.
D. operant conditioning.
E. classical conditioning.
D. operant conditioning.
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The surface area of the small intestine is dramatically increased due to the presence of _________ on the luminal surface.
A. villi and microvilli B. lacteals C. capillaries D. hydrolytic enzymes E. smooth muscle
When sodium ions diffuse into the axon’s
cytoplasm, the cytoplasm becomes
a. more positively charged. b. more negatively charged. c. neutrally charged. d. impermeable to more sodium ions. e. more than one of these
If flagellar rotation of Escherichia coli cells is ________, then CheA is ________.
A. clockwise; unphosphorylated B. clockwise; autophosphorylated C. counterclockwise; unphosphorylated D. counterclockwise; autophosphorylated
A sponge feeds itself by ________, drawing organisms along with water into itself for nourishment.
Fill in the blank(s) with the appropriate word(s).