Many strategies have been used to control leafy spurge, including the deliberate introduction of different species of flea beetles that feed on leafy spurge. Each flea beetle female may lay about 200 eggs in her one-year life span
In places where flea beetle introductions have quickly established large populations that have grown and stabilized, the population growth of these beetles most likely looked like which of these on a graph? A) A straight increasing line
B) A J-shaped curve
C) An S-shaped curve
D) An upside down U-curve
C
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Why have populations of neotropical migrants (birds that migrate from the U.S. to the tropics every year) such as tanagers declined so greatly in recent years even though their forest habitats in North America are relatively stable?
A. Loss of habitat in Central and South America. B. Pollution in the U.S. C. Colder winters in the U.S. D. They are being hunted for food in the tropics.
When organisms are distributed in small patchy aggregations the distribution is called: a. random
b. uniform. c. clumped. d. sketchy.
What are two ways to deal with thedegradation of a shared resource?
What will be an ideal response?
A geologist observes abundant fossils of a distinctive trilobite species in a shale, but this trilobite disappears as she walks through the shale
In younger rocks, just above the horizon where the fossil disappears another species of trilobite becomes the prominent fossil in similar shales. Which conclusion is most logical for this observation? A) A hurricane or other catastrophe killed all of the early species so the other species could move in. B) The second, trilobite group in the upper section went extinct where the change in fossils is seen. C) The organisms whose remains form the first fossil moved from the area for unknown reasons. D) The first trilobite species went extinct and its ecological niche was occupied by another species, which may have evolved from the first.