What unit of measure is most appropriate for expressing the size of bacteria?
A. nanometer
B. picometer
C. milimeter
D. micrometer
Answer: D
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Birds are different from all other living vertebrates because they:
A. can fly B. lack teeth C. have feathers D. are bipedal E. All of the choices provided are correct
The lungs move easily within their protective sacs due to
a. intrapleural fluid. b. leaking plasma. c. blood. d. mucus. e. both leaking plasma and mucus.
Which of the following is found in eukaryotic cells but not in the cells of bacteria?
A. nucleus B. mitochondria C. endoplasmic reticulum D. lysosomes E. All of the choices are correct.
Both walnut and Gingko trees lose their leaves in the fall when day length starts decreasing. Based on these observations, one may conclude that many tree species will lose their leaves in the fall in response to decreasing day length. This statement is an example of
A. a theory. B. an experiment. C. inductive reasoning. D. deductive reasoning.