What explains the similarities in the forelimbs of animals as diverse as humans, dogs, birds, and whales?
What will be an ideal response?
Answers will vary.
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One interpretation of the genetic evidence is that the intermixing of the Neandertal and the modern human lineages:
a. never occurred. b. will be impossible to determine. c. occurred between 2 million and 1 million years ago. d. occurred between 690,000 and 550,000 years ago. e. occurred between 80,000 and 50,000 years ago.
What is one of the chief advantages of slash-and-burn cultivation?
A. It involves a huge labor force in converting forest to agricultural fields. B. It can be carried out indefinitely on a single plot of land. C. It produces food without complex technology. D. It is effective in virtually any environment.
Pastoralists are specialized herders whose subsistence strategies focus on domesticated animals.
Answer the following statement true (T) or false (F)
Why might a superior innovation not be adopted?
A) The costs of adopting the new innovation might exceed the benefits. B) People may not be intelligent enough to master the new technology. C) The habits of the old system are more important than finding something that works better. D) New innovations are generally viewed suspiciously for a while.