Escherichia coli bacteria in human colons provide humans with vitamin K in return for a steady food supply and warm place to live. This is an example of a ____ relationship
a. mutualistic
b. predatory
c. commensal
d. parasitic
e. habitat
a
Biology & Microbiology
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An individual travels from one geographic location to another and joins a different population of the same species, introducing a new allele for a characteristic that wasn’t there before that individual’s arrival. This is an example of _______.
a. gene flow b. genetic drift c. mutation d. natural selection
Biology & Microbiology
What is unique about hydrothermal vents as an ecosystem? What will be an ideal response?
Biology & Microbiology
Semilunar valves prevent blood from flowing ________.
Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
All of these are reported to cause deformities in amphibians except:a
pesticides. b. pollution. c. trematodes. d. atrazine. e. predators
Biology & Microbiology