21.   Scientists agree that certain synthetic chemicals may mimic reproductive hormones.

22.   The big change came with modern synthetic chemicals.

23.   The cause was less clear in the Great Lakes, he said, where waters contain scores of synthetic organic chemicals.

24.   The experiments with squalamine, which Brem obtained as a synthetic chemical and not from sharks, were undertaken for a quite different reason.

25.   The report stressed the need for better studies of synthetic chemicals and more studies of natural food chemicals that might be suspect carcinogens.

26.   These synthetic estrogenlike chemicals used to make pesticides and plastics have been shown to foul up sex cycles in fish and other wildlife.

27.   These scientists say they are not arbitrarily dismissing fears that trace amounts of synthetic chemicals might injure people and wildlife.

28.   They were cited for their work in the synthesis of molecules, which has led to the development of catalysts applied in many synthetic chemicals and pharmaceuticals.

29.   Thousands of studies, most involving animals, convinced Colborn that scientists were failing to see increasing problems of infertility and birth defects from exposure to synthetic chemicals.

30.   Those contaminants can be inorganic chemicals and metals like lead, arsenic and mercury or synthetic organic chemicals such as pesticides.