The basic mechanism of viral multiplication is similar for all viruses
Indicate whether the statement is true or false
TRUE
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What conclusion can be drawn regarding a community in which many species are involved in a food
web?
a. It is more fragile since organisms have more than a single food source. b. It is more fragile since organisms have only a single food source. c. It is more stable since organisms have more than a single food source. d. It is more stable since organisms have only a single food source. e. It is very prone to damage from human interference.
What is the result when airborne sulfur and nitrogen oxides coat dust particles?
a. wet acid deposition b. dry acid deposition c. a chemical reaction that produces sulfuric and nitric acids d. wet acid deposition and increased soil pH when dust settles e. dry acid deposition and reduced soil pH when dust settles
The differential survival rates associated with birth weights in Figure 19-5 illustrate:
a. balanced polymorphism.
b. genetic drift.
c. neutral variation.
d. stabilizing selection.
e. disruptive selection
During the last decade, the U.S. Fish and Wildlife Service has worked to reestablish the critically endangered California condor in its last stronghold, the mountains of southern California
Recently, the service has also tried to establish a second population in the Grand Canyon region of Arizona. Why would the Fish and Wildlife Service consider it a high priority to establish two populations that are geographically distant from each other? A) Multiple condor populations reduce inbreeding. B) Multiple condor populations provide more opportunities for people to view the endangered species, which may cause more people to be concerned with its fate. C) Multiple condor populations reduce genetic drift within each population. D) Multiple condor populations reduce the risk of extinction due to localized catastrophes.