If you were to design a long-term research study to determine why there are no human births in Lapland during the months of August, September, and October, you would need to also examine a comparison population of humans in which births took place every month. The primary reason for including a comparison population within the design of this experiment would be to:
A. accumulate more facts that could be reported to other scientists.
B. test the effects of more than one variable at the same time.
C. prove that there are no births in Lapland during August, September, and October.
D. act as a control that would ensure that the results obtained are due to a difference in only one variable.
D. act as a control that would ensure that the results obtained are due to a difference in only one variable.
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Dog breeders maintain the purity of breeds by keeping dogs of different breeds apart when they are fertile. This kind of isolation is most similar to which of the following reproductive isolating mechanisms?
A) temporal isolation B) behavioral isolation C) mechanical isolation D) habitat isolation E) gametic isolation
Which are the MOST dominant chemolithotrophs in pelagic waters?
A) ammonia-oxidizing Archaea B) ammonia-oxidizing Bacteria C) sulfate-reducing Bacteria D) Prochlorococcus
The life threatening body-wide response that can occur when allergens enter the circulatory system and
cause a severe drop in blood pressure is called ____________________. Fill in the blank(s) with the appropriate word(s).
The bacteria on the outside of termite protozoa
A) Digest cellulose. B) Steer the protozoan to food. C) Are transient microbiota. D) Propel the protozoan. E) None of the above