When the frequency of nerve impulses slows or stops even when the stimulus continues at constant
strength, the individual has undergone
a. sensory adaptation.
b. tolerance.
c. perceptive degradation.
d. nerve damage.
e. tachyphylaxis.
A
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If you own a dog, each year, depending on the region where you live, you will need to buy
medication that treats roundworms and ticks and fleas. These organisms live either internally or externally on dogs and obtain all their nutrients from the dog. In some cases, dogs are harmed due to these interactions. This describes a __________ relationship.
a. commensal b. mutualistic c. parasitic d. tertiary
What evidence exists that some of the asteroids were geologically active in the distant past?
a. A few of the larger asteroids show similar reflectance spectra (colors) similar to achondrite stony lava-like meteorites. b. A few of the larger asteroids show similar reflectance spectra (colors) similar to carbonaceous chondrite meteorites. c. A few of the larger asteroids show similar reflectance spectra (colors) similar to Jovian planets.
Cladograms show the sequence of evolution of the characters in a clade.
a. true b. false
Which word best describes the structure of the cell membrane?
A.) bi-layer B.) rigid C.) impermeable D.) nonpolar