What is the unique feature of hormone-releasing IUDs?

What is the unique feature of hormone-releasing IUDs? Correct Answer Rendering the uterus unsuitable for the fertilized egg to implant

The hormone-releasing IUDs are very strong and have fewer side-effects. These stimulate the body’s mechanisms to prevent fertilization. They render the cervix hostile for sperms and also make the uterus not suitable for the blastocyst to the implant. Thus, even if fertilization occurs, the chances of it leading to pregnancy are almost nil.
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