Read the passage below carefully and then choose the correct pattern of organization. Discovery Educationtm Streaming © 2010

Species become extinct or endangered for a number of reasons, but the primary cause is the destruction of habitat. Drainage of wetlands, conversion of shrub lands to grazing lands, cutting and clearing of forests (especially in the Tropics, where destruction of the rain forests has continued at an alarming rate), urbanization and suburbanization, and highway and dam construction have seriously reduced available habitats. As the various habitats become fragmented into "islands," the remaining animal populations crowd into smaller areas, causing further habitat destruction. Species in these small islands lose contact with other populations of their own kind, thereby reducing their genetic variation and making them less adaptable to environmental change. These small populations are highly vulnerable to extinction; for some species, the fragmented habitats become too small to support a viable population.

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