Many species of gulls feed their chicks by regurgitating food. When parents return from foraging, the gull chicks peck at a red spot on the parent's bill, which causes the parents to open the bill and regurgitate their food
Chicks will peck at a red dot painted on any long,
slender object. For the chicks, pecking is a
____ and the red dot is a ____ . For the adult gulls, the chicks pecking at their bills is a ____
and regurgitating food is a ____ .
Fill in the blank with the appropriate word.
fixed action pattern, key stimulus, key stimulus, fixed action pattern
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The health risk of a pathogen is determined by its transmissibility and its virulence.
a. true b. false
Which component distributes water and nutrients throughout the plant body?
a. ground tissue
b. vascular tissue
c. dermal tissue
d. root
e. shoot
Antimicrobials known as "attachment antagonists" are particularly useful for preventing
A) bacterial protein synthesis. B) cell membrane synthesis. C) virus infection. D) nucleic acid synthesis. E) biofilm formation.
Bulk flow in the phloem tissue is mostly downward whereas bulk flow in xylem is mostly
A. upward. B. sideways. C. also downward. D. very little bulk flow occurs in xylem. E. flow of sugars.