Over time as erosion lowers the landscape a river valley will typically ________
A) become steeper and discharge increases in the streams
B) become narrower but with a lower gradient, entrenching meanders
C) become broader and lower gradient
D) deepen into a bigger and bigger canyon, like the Grand Canyon
C
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A savanna differs from a steppe in that the grasses are
A) intolerant to freezes in a savanna. B) only in riparian zones in a savanna. C) taller in a savanna. D) in drier areas in a savanna.
The term "second genetic code" refers to which of the following?
A) The ability of the codon and anticodon to recognize each other. B) The ability of aminoacyl-tRNA synthetases to correctly pair an amino acid with its correct tRNA. C) The ability of DNA to transfer genetic information to RNA. D) None of these is correct.
Which animal is considered to be a suspension feeder?
A) Fish B) Sea stars C) Sponges D) None of these choices
Which of the following must we know when we carry out a titration?
A) the concentrations of all reactants except one B) the stoichiometric ratio of the reactants C) the volumes all reactants D) all of the above