The oxygen-minimum layer of an ocean occurs in the
A) abyssalpelagic zone.
B) bathypelagic zone.
C) epipelagic zone.
D) mesopelagic zone.
D
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Heritability may be calculated as which of the following?
A. The total variance minus environmental variance B. Total variance minus genetic variance C. Genetic variance divided by environmental variance D. Genetic variance divided by total variance
The morphological species concept involves the identification of certain structural traits, called ________, to distinguish one species from another.
A. analogous traits B. convergent traits C. homologous traits D. diagnostic traits
A developing human is considered an embryo after ________ weeks
A) 16 B) 4 C) 12 D) 2 E) 8
The number of T cells drops to below 200 cells/microliter in which phase of HIV infection?
A) phase 1 B) phase 2 C) phase 3 D) initial phase E) asymptomatic phase