Which part of the leaf stores toxic or unpalatable compounds in order to deter grazing herbivores?
a. cuticle
b. stomata
c. trichomes
d. mesophyll
c. trichomes
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How can predators influence the species richness and structure of communities?
a. Predators increase the carrying capacity of their prey. b. Predators destabilize competitive interactions among their prey. c. Predators increase the population sizes of pathogens. d. Predators increase the population sizes of their prey. e. Predators reduce the population sizes of their prey.
Why did the British naturalist Edward Forbes conclude that animal life could not exist in the sea below a depth of 55 meters?
What will be an ideal response?
Jean-Luc Eiselé and his coworkers used ______ receptors in their research on neurotransmitter
receptor function.
a. African clawed frog b. toad c. artificial d. dog e. human
All of the following statements about sensory receptors are true EXCEPT
A. sensory receptors monitor the internal environment of the body. B. photoreceptors include rod and cone cells. C. chemoreception is believed to be a primitive sense in animals. D. the retina of the eye contains photoreceptors that are sensitive to light. E. sensory receptors for taste are found in the nose and mouth.