Define four ways in which evolutionary change occurs in populations.
What will be an ideal response?
Answer may vary.
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Which of the following statements about shifting cultivation is true?
A. It is typically associated with the use of draft animals. B. It cannot support permanent villages. C. It requires irrigation. D. It requires cultivators to change plots of land, with the fallowing durations varying in different societies. E. It relies extensively on chemical fertilizers.
Homo sapiens were foragers until about ____ years ago
a. 100,000 b. 50,000 c. 10,000 d. 2,000
By using the designation Homo habilis, Louis Leakey was implying all of these EXCEPT
a. there were at least two hominin lineages present at Olduvai Gorge. b. the Homo lineage was distinct from the australopiths. c. that Homo habilis was our ancestor. d. Homo habilis was not a hominin. e. a revision of the classification was necessary.
Mutations are the most important source of variety on which natural selection depends and operates. There are two forms of mutations,
A. both discovered by Mendel. B. cancer-causing mutations and chromosomal rearrangement. C. and both always result in phenotypic change. D. and both occur only during the development of an individual. E. called base substitution mutation and chromosomal rearrangement.