How bacteria survive in a world full of killer bacteriophages

The Quick Take
Humans throughout history have invented a variety of ways to fight back against troublesome bacteria. But bacteria live in a dangerous world too. The human body and other bacteria-rich environments abound with bacteriophages, or viruses that prey upon bacteria. Phages can sometimes outnumber bacteria a hundredfold, yet the bacteria endure and even thrive. What gives?
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