A growing threat.This graph graph, figure that shows relationships between quantities. The graph of a function y=f (x) is the set of points with coordinates [x, f (x)] in the xy-plane, when x and y are numbers. shows the changes in the number of threatened species of mammals The class Mammalia (the Mammals) is divided into two subclasses based on reproductive techniques: egg laying mammals (the Monotremes); and mammals which give live birth. The latter subclass is divided into two infraclasses: pouched mammals (the marsupials); and the placental mammals. , reptiles reptiles terrestrial or aquatic vertebrates which breathe air through lungs and have a skin covering of horny scales. They are poikilothermic, oviparous or ovoviviparous, and, if they have legs they are short and constructed solely for crawling. , and fish since 1996. Study the graph, and then answer the questions. 1. How did the number of threatened mammal mammal, an animal of the highest class of vertebrates, the Mammalia. The female has mammary glands, which secrete milk for the nourishment of the young after birth. species change from 2002 to 2007? (A) It increased. (B) It decreased. (C) It stayed the same. 2. Roughly how many more fish species than reptile species were threatened in 2002? (A) twice as many (B) three times as many (C) five times as many 3. Which group's number of threatened species nearly doubled from 1996 to 2007? (A) mammals (B) fish (C) reptiles 4. How many mammal, reptile, and fish species are currently threatened? (A) 496 (B) 526 (C) 596 5. Which group currently has the most threatened species? (A) mammals (B) fish (C) reptiles
Number of Threatened Species
KEY
Year Mammals Fish Reptiles
1996 169 157 41
2002 181 157 55
2007 163 254 79
Note: Table made from bar graph.
Source: The World Conservation Union
Answer Key STUDENT EDITION A Growing Threat (page 8) 1. B, 2. B, 3. C, 4. A, 5. B |
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