In a mammal, blood leaving the lungs goes to the
A) heart.
B) limbs.
C) liver.
D) brain.
Answer: A
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An illness outbreak occurs in New York City birds in the late 1990s. After a lengthy scientific investigation, the Centers for Disease Control (CDC) determine that the agent causing the birds to die is the West Nile virus
Outbreaks of this illness have been observed in several other countries in Asia and the Middle East across the last 50 years, but not in the United States. With this information, what would be the best categorization of this infectious agent/disease A. This is clearly a reemerging infection. It's been around for a long time, and it is reappearing in a susceptible population again. B. This is clearly a nosocomial infection. It's transmitted from animals to human beings in urban environments. C. This is clearly an emerging infection. It hasn't been around that long, and it has made a jump across continents into a new susceptible population. D. This is clearly not a concern to human beings--maybe it's emerging in animals, maybe it's reemerging, maybe it's nosomial. But who cares? It's only in birds.
Which of the following is a phase of the
menstrual cycle? a. follicular phase b. luteal phase c. ovulation d. all of these e. none of these
The number of currently described species on the planet is about ________.
a) 17,000 b) 150,000 c) 1.5 million d) 10 million
Which of the following floral reproductive organs consists of an anther and, in most species, a filament?
A. Carpel B. Stamen C. Corolla D. Stigma E. Calyx