The primary organisms that make up the deep scattering layer are:
a. zooplankton and fishes.
b. phytoplankton.
c. seston.
d. nanoplankton.
e. marine snow animals.
A
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Which of the following are effective treatments for some allergic reactions?
I) antihistamines II) epinephrine III) corticosteroids A) only I and III B) only II and III C) only I and IIII D) I, II, and III
The most prominent water-borne pathogens of recent times include all of the following except ______.
A. Staphylococcus B. Salmonella C. Norwalk viruses D. Cryptosporidium
Which of the following is not true about monozygotic twins?
A) They share all alleles at all loci. B) They have a genetic relatedness of 0.5. C) They have a genetic relatedness of 1.0. D) They come from the joining of a single egg with a single sperm cell. E) They are the result of a split of the zygote after fertilization.
The primary mechanism for exchange of substances across the capillary wall is
A) bulk flow. B) vesicle transport. C) active transport. D) mediated transport. E) diffusion.