Approximately _____ percent of a leaf is composed of air spaces
a. 25
b. 33
c. 50
d. 75
B
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If the multiregional hypothesis of human origins is correct, modern human populations last shared a common ancestor around _____ years ago. If the out-of-Africa hypothesis is correct, we last shared a common ancestor around _____ years ago
A. 2 million; 200,000 B. 3.2 million; 2 million C. 5-7 million; 2 million D. 5-7 million; 200,000 E. 3.2 million; 200,000
Nitrogenous waste is excreted from Malpighian tubules mainly in the form of
a. nitrate. b. ammonia. c. uric acid. d. amino acids. e. urea.
Mary died suddenly of an aortic aneurysm (the sudden bursting of one of the body's largest blood vessels). Which of the following conditions should her children worry most about?
A) hemophilia B) Turner syndrome C) Marfan syndrome D) albinism
Which of the following is a symptom of Cushing's disease?
a. loss of ability to cope with stress b. mild infection c. abnormally large face and hands d. fat deposition around the trunk e. mental retardation