Species which are specialists
A. are tolerant of environmental change.
B. tend to have higher reproductive rates than generalists.
C. do not have narrowly specific habitat requirements.
D. have narrowly specific habitat requirements.
Answer: D
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Compare the length (in miles) of the “boundary course” of the river with the main channel of the present course. (You can measure the distance with a piece of string, or your instructor may show you a more precise method.)
The following questions are based on Map T-5, a portion of the “Jackson, Mississippi-Louisiana” topographic map (scale 1:250,000; contour interval 50 feet; dashed lines are supplementary contours at 25-foot intervals). This map shows the Mississippi River near the town of Vicksburg, Mississippi (32°49'56"N, 91°11'07"W). A color satellite image of this same region is shown in Figure 40-5 (scan the QR code for this exercise or go to the Lab Manual website and Exercise 40). The eastern bluffs of the Mississippi River floodplain can be seen in the southeast corner of the map. The dashed black line along the Mississippi River shows the state boundary between Mississippi and Louisiana. Notice that the “boundary course” of the Mississippi River is quite different from the present course of the river. Some of the changes were natural, others were artificial. There is an extensive set of artificial levees along the course of the river (shown with closely spaced brown tick marks). (a) Length of present course: __________ miles (b) Length of “boundary course”: __________ miles (c) Amount of shortening: __________ miles (d) The present course length represents what percentage of the boundary course length? "present" / "boundary" x 1002 __________ %
Air pockets are areas of ____ that can form in clear air
A) descending air B) ascending air C) wind shear D) high pressure
In recent years, the duration of residency for unauthorized immigrants to the United States has been
A) decreasing. B) increasing. C) relatively constant. D) has averaged only 2 years. E) unknown since the immigrants are unauthorized.
Today, there are over 270,000 plant species with conductive tissues and material flow systems known as
A) vascular plants. B) xeriphytes. C) blue-green algae. D) cyanobacteria.