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