Nitrogen supplies to atoll coral reefs are thought to come from all except
a. nitrogen fixing bacteria.
b. planktonic cyanobacteria wind-driven to the reefs.
c. re-cycling by fish fecal material.
d. runoff from land.
D
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Male anglerfish often attach to the female so they can
a. utilize the female's increased ability to find prey. b. utilize the female's increased predator avoidance. c. provide sperm to fertilize eggs. d. avoid being eaten by the female. e. obtain growth hormones from her bloodstream.
A person's unique DNA is carried within some of the cells and tissues of their body. These include all of the following EXCEPT:
A. intestines B. blood. C. skin cells. D. saliva. E. All of the above contain a person's DNA.
Which is the first eon for which there is evidence of life?
A. Archean eon B. Proterozoic eon C. Stromatolite eon D. Hadean eon E. Phanerozoic eon
Mercurial fixatives are satisfactory when stains for spirochetes are to be done
a. true b. false