What systems lend themselves best to the study of environmental factors that lead to the maintenance of sexual reproduction?
a. cyclical parthenogenetic populations that follow highly predictable seasonal patterns independent of environmental changes
b. obligate sexual species taxa such as most birds
c. species that are polymorphic for sexual/asexual reproduction and show the same proportion of sexual reproduction in all environments
d. populations that respond to environmental changes with a change from asexual to sexual reproduction
D
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This material provides a mechanism for the maintenance of normal human skin that prevents drying and also is involved in the production of an acid pH to prevent the colonization of poten-tially pathogenic organisms
a. sweat b. bacterocins c. antibodies d. sebum
What structure best represents a polymer?
A. A fatty acid. B. A monosaccharide. C. A nucleotide. D. An amino acid. E. A protein.
The leading cause of pelvic inflammatory disease is ________.
A. gonorrhea B. Chlamydia infection C. genital herpes D. HIV infection E. syphilis
Aerobic respiration occurs in
A) anaerobic sludge digestion. B) primary sewage treatment. C) secondary sewage treatment. D) tertiary sewage treatment. E) water treatment.