A sagittal crest is
a. only present in some nonhuman primates.
b. a characteristic of some A. afarensis species.
c. a raised ridge of bone running along the midline of the cranium for the attachment of muscles.
d. not present in any hominin fossils.
e. only found in humans today
C
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Adaptive niche refers to:
a. mammalian characteristics which evolved from an arboreal environment. b. an adaptive advantage in a purely terrestrial environment. c. a numerical device that indicates the number of each type of tooth. d. an organism's entire way of life. e. adaptive benefit of surrounding forests and rivers.
When the marginal product of labor increases, the marginal cost ________ and when the marginal product of labor reaches its maximum the marginal cost is at its ________.
A) increases; maximum B) decreases; maximum C) decreases; minimum D) increases; minimum
Pre-colonial American societies had examples of both chiefdoms and states. Explain how you would distinguish between the levels of political organization, and give an example of each from the Americas
What will be an ideal response?
The original settlers of the Americas came from
A. Southeast Asia. B. Russia. C. Northwest Asia. D. Europe. E. None of these answers is correct.