Fish can control buoyancy by:
a. holding air in their lungs.
b. expelling air from their lungs.
c. facilitating swift operculum movement.
d. adjusting the amount of gas in their swim bladders.
e. inflating the chambers of their tracheae.
d
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Diversity indices such as the Shannon diversity index are very valuable to
A. agricultural economists who study crop production. B. researchers calculating evapotranspiration rates. C. the formation of climax communities. D. conservation biologists who study rare species. E. scientists studying microbial diversity.
The type of contraception technique that can interfere with implantation of a fertilized egg is ____
a. tubal ligation b. spermicidal jelly c. birth control pills d. an intrauterine device
e. a diaphragmDuring pregnancy, a maternal antibody transported across the placenta to the fetal bloodstream can cause a problem if
the mother ____. a. has passed on any teratogens b. and baby have different Rh factors c. is producing HCG d. smokes during pregnancy e. uses alcohol during pregnancy
Which of the following characteristics is not a property of cells or living things?
A. nucleus B. cell boundary C. responds to stimulus D. ability to replicate E. All of the choices are not fundamental characteristics of living things.