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Ernst Mayr was a prominent biologist and evolutionist, and his work "Animal Species and Evolution" contributed significantly to the understanding of evolution and systematics.
In connection with technological progress, significant changes are taking place with regard to the risks to which workers are exposed. At the same time, new, more complete knowledge is being gathered in the objectification of risks, assessment of exposure
The environmental movement has helped produce significant improvements in the world around us—from cleaner air to the preservation of natural wonders such as Yellowstone.