What causes rickets?
a. An insufficient amount of melanin
b. Overexposure to ultraviolet radiation
c. Too much vitamin D
d. An insufficient amount of vitamin D
e. ?Too few melanocytes
d
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Stratigraphy is important in an archaeological excavation because it:
A. always provides an accurate date for the site. B. usually means that ancient bones are present. C. is a record of deposits at the site. D. ensures good conditions for preservation.
Species that occupy mutually exclusive geographical areas are called:
A. allopatric species B. ecological species C. sympatric species D. hybrid species
All analyses have shown that Homo erectus hominins represent a different hominin than their more ancient African predecessors
Indicate whether the statement is true or false
The classic H. erectus traits included all of the following EXCEPT:
A. a discontinuous supraorbital torus. B. a long cranium. C. a sagittal keel. D. an occipital torus.