What feature of the island of Hawaii, after its
formation, most spurred the rapid speciation of
colonizing birds?
a. diversity of habitats
b. lack of competitors
c. climate conditions
d. abundance of plant food sources
e. abundance of insects for food
Answer: b
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The letter “C” in the above figure represents
a. trigger zone. b. output zone. c. input zone. d. conducting zone. e. none of these.
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.
Spores and seeds have basically the same function—dispersal—but are vastly different because __________.
a. spores have a protective outer covering and seeds do not b. spores have an embryo and seeds do not c. spores have stored nutrition and seeds do not d. spores are unicellular and seeds are not e. spores are only produced by fungi
In final preparation for a climb up Mt. Everest, climbers take up residence at base camp for a period of days to weeks before the climb. During this time, the climbers must acclimate physiologically to the low oxygen levels. Out of a group of ten climbers, one is unable to acclimate to the low oxygen levels, so he cannot make the final part of the climb. What would explain his lack of acclimation?
A. The levels of erythropoietin in his system are too low. B. The levels of hemopoietin in his system are too low. C. The levels of renin-angiotensin in his system are too low. D. The levels of adrenocorticotropin in his system are too low.