Lucy was discovered by Donald Johanson at Hadar, in the Awash Valley of __________ in 1974. Lucy's species lived from around __________
a. Kenya; 4.0 to 3.0 million years ago
b. Tanzania; 2.5 to 1.5 million years ago
c. South Africa; 3.5 to 2.5 million years ago
d. Ethiopia; 3.9 to 2.9 million years ago
Correct Answer: d
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If a perfectly competitive firm is producing at the output level where marginal revenue is equal to marginal cost and at this output level, the market price is less than the firm's average total cost, the firm is ________.
A) not producing at the profit-maximizing output level B) earning a competitive return C) earning economic profits D) incurring an economic loss
Answer the following questions about archaeology.The Three Dynasties of China were Xia, Shang, and Zhou.
Answer the following statement true (T) or false (F)
Neandertal skeletal features include:
A. prominent brow ridge B. "bun-shaped" occipital C. curvature of the femur D. all of these
According to the Hardy-Weinberg genetic equilibrium formula, the value of q is the
a. frequency of dominant alleles. b. frequency of recessive alleles. c. total number of alleles. d. total number of population genetics. e. result of the Hardy-Weinberg problem.