Refer to Figure 51-2. The nervous system will develop from which structure?
a. 1
b. 2
c. 3
d. 4
e. a structure not numbered in this figure
E
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Which of the following statements is false?
A. It is not possible to eradicate a disease. B. Global travel spreads pathogens more quickly than ever before. C. The evolution of drug-resistant pathogens is on the rise. D. Failure to follow treatment regimens drives the evolution of drug resistance. E. Scientists are engaged in an evolutionary arms race with disease-causing organisms.
Which of the following produce organic acids that may contribute to weathering of rocks?
A. arctic plants B. water plants C. aerial plants D. lichens E. mosses
Bile is ____
a. an enzyme that digests fat b. made in the gallbladder c. stored in the liver d. a mix of salts, pigments, and cholesterol e. necessary for protein digestion
When the left atrium is contracting ____
a. the left ventricle is contracting b. the right atrium is contracting c. blood is moving away from the heart d. blood is leaving the left ventricle e. the bicuspid valve is closed