The fossil Lucy (Australopithecus afarensis) is significant because, at _____ years old, hers is the first species to _____
A. 20 million; have been fully bipedal
B. 1.3 million; have hominin brow ridges
C. 3.2 million years; be fully bipedal
D. 1.3 million; migrate out of Africa
E. 600,000; have homin brow ridges
C
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A researcher is investigating the morphology of complete flowers. Which of the following organs must his flowers contain?
A. calyx, corolla, receptacle, and carpels B. calyx, corolla, carpels, and ovules C. calyx, corolla, stamens, and anthers D. calyx, corolla, carpels, and pistils E. calyx, corolla, androecium, and gynoecium
Chiasmata form during which phase of meiosis?
a. prophase I b. metaphase I c. telophase I d. prophase II e. metaphase II
Tinbergen's wasp experiments demonstrated that wasps find their nests by ____ cues
a. olfactory b. auditory c. visual d. both olfactory and visual e. both magnetic and auditory
In 2005, the United States had a population of approximately 295,000,000 people. If the birth rate was 13 births for every 1,000 people, approximately how many births occurred in the United States in 2005?
A) 3,800 B) 38,000 C) 380,000 D) 3,800,000 E) 38,000,000