Estuaries feature a characteristic salinity profile called a(n) ________.
Fill in the blank(s) with the appropriate word(s).
salt wedge
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In a plant, the exchange of gases with the environment involves
a. leaves. b. roots. c. stems. d. all of these
Prescription drugs such as Prozac help maintain higher levels of serotonin in the brain. What effect will this have on an individual?
A) It will act as an antidepressant because a lack of serotonin is considered a cause of depression symptoms. B) It will act to suppress impulsive behavior because too much serotonin causes children to act out. C) It will cause a patient to be sleepy because serotonin is essential to a good night's sleep. D) It will cause tetany due to an overproduction of acetylcholine.
Human activities have been identified as the causal factor in numerous documented extinctions. Which of the following specific causes has been identified in the majority of cases examined?
A) habitat reduction and modification B) small population size C) introduction of exotic species D) overexploitation
Which observation does not provide evidence that birds are theropod dinosaurs?
A. There are many fossil therapods that have been found with feathers. B. Birds and theropods are both missing the fifth toe, and the first toe is rotated backward. C. Both fossil theropods and modern birds have a wishbone. D. Birds and theropods have three-digits on their forelimbs. E. Answer Both pterosaurs and birds evolved flight.