Which of these events occurs specifically in the embryo and not the fetus?
A) Hair growth
B) Maturation of the respiratory system
C) Neural tube formation
D) Bone replaces cartilage
C) Neural tube formation
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Tibetan people have ____ in their blood despite living at high altitude
a. less oxygen b. more erythropoietin c. less erythropoietin d. more hemoglobin e. less hemoglobin
The species Homo sapiens is thought to be how many years old?
a. 25,000 b. 60,000 c. 95,000 d. 120,000 e. 195,000
The Dust Bowl of the 1930s was the result of
destruction of a. deserts. b. chaparrals. c. tallgrass prairies. d. short-grass prairies. e. temperate deciduous forests.
Which of the following is the main difference between the urinary system of males and females?
a. Men have two urethras, while women have only one urethra. b. The urethra is shorter in females. c. Men have longer ureters than females. d. Kidneys tend to be larger in females. e. The female urethra passes through the prostate gland.