Reading and All That Jazz 5th Edition by Rita McCarthy ,Peter Mather

Exercise 1

In 1995, school children on a summer field trip to a marsh in southern Minnesota discovered dozens of frogs with malformed, missing, or extra legs. What could be causing these problems The widespread use of pesticides and herbicides in agriculture, together with industrial toxins released into the air and water, make toxic synthetic chemicals likely suspects. Since frogs spend most of their lives in water, they easily absorb toxins through their thin skin. Other factors such as metals released by industry, parasites, and excessive amounts of ultraviolet radiation from the sun could also play a role in these deformities. Unfortunately, there may be no single, simple cause. Varying combinations of some or all of these factors may be at work.
(p. 16)
Mode of Organization: _____________________________
Reasons: _________________________________________________________