When water melts from a solid ice cube to a liquid, its volume ________ and its mass ________.
A. Decreases; increases
B. Decreases; stays the same
C. Increases; stays the same
D. Increases; decreases
Answer: B
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Which isolating mechanism is postzygotic?
A. hybrid sterility B. behavioral isolation C. ecological isolation D. mechanical isolation E. temporal isolation
The reported effects of toxins on marine zooplankton include
a. increased sinking rate. b. faster growth. c. tumors. d. altered growth and development. e. increase in photosynthetic rates.
The exchange surfaces of fish gills are arranged as rows of
A. lamellae. B. parabronchi. C. trachea. D. spiracles. E. alveoli.
Achondroplasia
a. is inherited as an autosomal recessive condition. b. affects about one in one million people. c. affects only homozygotes. d. is characterized by abnormally short arms and legs. e. is all of these.