Charles Darwin
a. grew up in modest circumstances.
b. began to doubt the fixity of species during a voyage around the world in the 1830s.
c. received no formal education.
d. spent two years in Africa where he developed the theory of natural selection.
e. was a physician who studied natural history as a hobby.
b
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Slash-and-burn, or swidden, agriculture has been practiced
A) only in semiarid savannas, where the sun is strong enough. B) only in temperate regions where there are dry forests. C) in Europe and North America until a few centuries ago, but today mainly in tropical regions. D) in tropical regions until a few centuries ago, but today mainly in Europe and North America. E) only in tropical areas, where the soils is not fertile enough for other forms of agriculture.
________ are proteins produced as a defense mechanism to attack a foreign substance invading the body
Fill in the blank(s) with correct word
Hominin emergence is characterized by the simultaneous appearance of bipedalism, toolmaking behavior, and a large brain
Indicate whether the statement is true or false
Why is it so difficult to pinpoint the emergence of the earliest languages?
A) Written language only appeared about 5,000 years ago. B) Modern apes have a rudimentary language, so it must date to at least the divergence of the human and ape lineages. C) There are clear structural differences in the brains of people who speak and people who don't, but we have no fossilized evidence of brain structure. D) Every culture reports that they have been able to speak since the beginning of time.