Which bird is a brood parasite and lays its eggs in the nests of other birds?
a. catbird
b. cowbird
c. magpie
d. Kirtland warbler
e. blue jay
ANSWER: b
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Which of the following respiratory systems is NOT closely associated with the blood supply?
A) the lungs of a vertebrate B) the gills of a fish C) the tracheal system of an insect D) the skin of an earthworm
Females who are carriers for hemophilia Select one:
a. All of the answer choices are correct. b. theoretically pass the allele for hemophilia to half of their daughters. c. usually do not show any symptoms of hemophilia. d. theoretically pass the allele for hemophilia to half of their offspring. e. theoretically pass the allele for hemophilia to half of their sons.
According to the U.S. Endangered Species Act (ESA), the difference between an endangered species and a threatened one is that
A) an endangered species is closer to extinction. B) a threatened species is closer to extinction. C) threatened species are endangered species outside the U.S. borders. D) endangered species are mainly tropical. E) only endangered species are vertebrates.
In early spring 2009, the CDC reported several dozen cases of novel H1N1 influenza ("swine flu") in the United States. By the end of the year millions of people had been infected. The pattern of novel H1N1 cases in the United States represents a(n) ________ disease.
A. epidemic B. endemic C. sporadic D. pandemic E. opportunistic