For what reason might scientists change the most current classification system?
A) if more species became extinct
B) if more types of vertebrates were discovered
C) if more information became available on the evolutionary history of existing species
D) if new species evolved
C
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Of the following, which is the MOST common AIDS-associated opportunistic disease?
A) Pneumocystis carinii pneumonia B) cryptosporidiosis C) histoplasmosis D) cryptococcosis
Arrange the following genetic terms in order from smallest to largest
A. gene; DNA strand; chromosome; genome B. genome; gene; chromosome; DNA strand C. DNA strand; chromosome; Gene; Genome D. DNA strand; Gene; Genome; Chromosome E. Gene; Chromosome; DNA strand; Genome
Paired homologous chromosomes are found at the spindle equator during
a. metaphase I. b. telophase I. c. prophase II. d. metaphase II. e. anaphase II.
Building on the ideas first proposed by Hutton, Lyell aimed to explain Earth's geological features using an approach known as uniformitarianism, which depends on:
a. large-scale geological events. b. the same geological processes currently observable. c. geological processes operating over very long periods of time. d. B and C