In humans, variations in skin color are due to differences in the amount, type, and distribution of the pigment
____________________.Fill in the blank(s) with the appropriate word(s).
melanin
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Which species of Burkholderia is the one most commonly found in clinical specimens?
a. Burkholderia ralstonia b. B. pseudomallei c. B. mallei d. B. cepacia
Consider the 4.6-billion-year history of the Earth. Geological and fossil evidence indicates that during the greatest fraction of its history, the Earth
a. was too hot to have either a solid surface or any form of life. b. had organic molecules in liquid water, but no living forms. c. had unicellular organisms, but not multicellular. d. had both multicellular and unicellular organisms, but no terrestrial (land) forms. e. had both terrestrial, freshwater, and marine organisms, both unicellular and multicellular.
Which type of chemical bond exists within a water molecule?
A. weak B. covalent C. hydrogen D. ionic E. It depends on the temperature of the water.
Which sequence of stages in mitosis is correct?
A. prophase, anaphase, prometaphase, metaphase, telophase B. prophase, telophase, anaphase, prometaphase, metaphase C. prophase, prometaphase, metaphase, anaphase, telophase D. telophase, anaphase, prophase, prometaphase, metaphase E. anaphase, prometaphase, metaphase, prophase, telophase