Continental drift caused the large supercontinent that existed during the Paleozoic era to separate into a northern
continent, called ____, and a southern continent, called ____.
a. Pangaea; Laurasia
b. Laurasia; Gondwana
c. Gondwana; Laurasia
d. Pangaea; Gondwana
e. Gondwana; Pangaea
ANSWER: b
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Three fatty acids bonded together with a glycerol are found in a(n):
A. enzyme. B. chlorophyll pigment. C. phospholipid. D. triglyceride. E. alcohol.
Intrinsic factor is used to aid in the absorption of
a. vitamin E. b. vitamin C. c. vitamin D. d. vitamin K. e. vitamin B12.
Examples of "new" features, which include wings on insects, flowers on plants, and feathers on birds,
are referred to as: a. preadaptations. b. allometric growth. c. allopolyploidy. d. paedomorphosis. e. punctuated equilibrium.
Uranium-235, with a half-life of 713,000,000 years, decays to Lead-207. If a rock sample is determined to have one-quarter of the uranium-235 content it had when it formed, the age of the rock sample can be estimated to be approximately __________ years old.
A. 28.5 billion B. 713. million C. 1.4 billion D. 178 million