The fact that water is less dense as a solid than as a liquid explains why:
A) water is such a good solvent.
B) water can resist temperature changes.
C) ice floats on top of liquid water.
D) ice cubes sink when placed in a glass of water.
E) oil never dissolves in water.
C) ice floats on top of liquid water.
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a. fishes b. amphibians c. reptiles d. birds e. mammals
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Which component of a muscle does the calcium ion combine with to allow a contraction to occur?
A) myosin head B) actin C) troponin D) T tubule
Which of the following items is NOT a part of the name of a restriction enzyme?
A) the Gram reaction of the source bacterium B) the specific epithet of the source bacterium C) Roman numerals to indicate its order of discovery D) the strain of the source bacterium E) the genus of the source bacterium