Air passage into the trachea of most insects is controlled by the closing and opening of valves, which operate special openings called
A. spiracles.
B. ocelli.
C. ommatidia.
D. book lungs.
E. Malpighian tubules.
A. spiracles.
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Recall that sedimentary rocks, living organisms, oceans, and soil are all carbon reservoirs. If the carbon in each of these reservoirs was instantly transformed into atmospheric CO2, which reservoir would contribute the most CO2 to the atmosphere?
A. sedimentary rocks B. living organisms C. oceans D. soil
A microbial ________ is a collection of strains that share many stable properties and differ significantly from other groups of strains.
Fill in the blank(s) with the appropriate word(s).
The study of the factors that influence changes in a population's size is
A. population density. B. population geology. C. population dynamics. D. population dispersion. E. population ethology.
Joan and her doctor notice a suspicious lump in her breast. Joan also has a family history of breast cancer. Which of the following is not a likely next step as they work to determine the cause of the lump?
A. performing a diagnostic mammogram B. genetic testing for mutations in the BRCA1 gene C. taking a biopsy of the lump to look for the presence of cancer cells D. performing a mastectomy to remove all breast tissue in that breast