What selective pressures are likely to have led to the evolution of regulatory systems like operons? Why not simply express these genes continuously?

Name: What selective pressures are likely to have led to the evolution of regulatory systems like operons? Why not simply express these genes continuously?
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The Answer of What selective pressures are likely to have led to the evolution of regulatory systems like operons? Why not simply express these genes continuously?

What Selective Pressures Are Likely to Have Led to the Evolution