Major risk factors for lung cancer include:
A) female sex and age over 40 years.
B) frequent respiratory infections and asthma.
C) cigarette smoking and exposure to asbestos.
D) chewing tobacco use and a history of allergies.
Answer: C) cigarette smoking and exposure to asbestos.
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Five species of ants can be found on aspen sunflowers (Helianthella quinquenervis), which live in wet mountain meadows of the Rocky Mountains. The aspen sunflowers provide nectar to the ants in special structures called extrafloral nectaries
The ants, in turn, protect the sunflowers from other insects. The ants, however, are not found solely on the sunflowers—they can be found tending aphids on other flower species and collecting nectar from other species as well. This, then, is an example of a(n): A. obligate mutualism B. obligate antagonism C. facultative mutualism D. facultative antagonism E. none of the answer options are correct.
True or false: The sequence of species that colonize a recently disturbed area through succession is unpredictable
A. true B. false
The structures responsible for detecting linear movement relative to the pull of gravity are labeled __________ in Figure 43-2
a. 1 and 3
b. 4 and 6
c. 3 and 5
d. 1 and 6
e. 4 and 7
During viral reproduction, HBV form an immature core particle made up of which components?
A. Core protein B. Reverse transcriptase C. Plus-strand RNA pregenome D. All of these make up the immature core particle.