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

Biology & Microbiology

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Intrinsic factor is used to aid in the absorption of

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Examples of "new" features, which include wings on insects, flowers on plants, and feathers on birds,

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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.

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