How do bacteria protect themselves against viruses?
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Ответ:
the immune systems include a vast array of restriction enzymes, which help cut up the viral DNA and render it ineffective.
Ответ:
The correct statements are emphasize cost-effective methods to protect the air and encourage people to study the effects of dirty air on human health.
Explanation:
The Clean Air Act offered funds for federal research in air pollution. The Act was established in 1963 and was the first federal legislation considering monitoring of air pollution. It created a federal program within the United States Public Health Service and permitted research into methods for controlling and monitoring air pollution.