Stable isotope analysis to indicate whether or not certain elements have been processed by an organism is based on the observation that ________.
A. microbes generally prefer using the heavier of two stable isotopes
B. microbes have no preference with regard to heavy versus light isotopes
C. microbes generally prefer using the lighter of two stable isotopes
D. None of the choices are correct.
Answer: C
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The odontophore of molluscs is part of the:
a. digestive system. b. nervous system. c. excretory system. d. defense system. e. reproductive system.
The structure labeled "C" is the
a. right ventricle. b. left atrium. c. left ventricle. d. trunk of the pulmonary arteries. e. right ventricle
Chronically high blood pressure is called
a. ventricular fibrillation. b. hypertension. c. leukemia. d. sickle-cell anemia. e. a stroke
Which of the following are characteristics of a keystone species?
A. They are most often mammals. B. They evoke a strong emotional response in people. C. Their presence dictates the survival of the entire community. D. They have a very large population. E. None of these are characteristics of keystone species.