Vibrio cholerae produces a toxin that destroys the intestinal epithelium. This leads to massive diarrhea; the diarrhea can kill the human via dehydration but helps the bacteria spread and colonize other humans. What is this relationship?
A. Symbiotic
B. Atavistic
C. Commensalistic
D. Mutualistic
Answer: A
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In the Northern Hemisphere, recall that atmospheric CO2 levels are highest in early spring and lowest during early fall. What accounts for this seasonal fluctuation in atmospheric CO2 levels? Select all that apply
A. photosynthesis B. human activities C. respiration D. biomineralization E. plate tectonics
Which of the following defines ecological resistance?
a. the ability of an ecosystem to remain at equilibrium despite disturbances b. the ability of a species or group of species to synthesize food molecules c. the speed at which an ecosystem recovers equilibrium after being disturbed d. the actions required for the species in a system to remain the same
The ________ continually senses and adjusts our body systems to maintain homeostasis
Fill in the blank(s) with correct word
What does fossil evidence show to differentiate Homo erectus from Homo habilis?
a. H. erectus did not use tools. b. H. erectus was shorter than H. habilis. c. H. erectus had a larger brain than H. habilis. d. H. erectus had more pronounced sexual dimorphism than H. habilis. e. H. erectus was the first member of the genus Homo without pronounced supraorbital ridges.