Question

how do barrier devices differ from hormonal methods for contraception?
barrier devices are placed on the skin, while hormonal methods are inserted inside the uterus for varying periods of time.
barrier devices help prevent pregnancy, while hormonal methods help prevent sexually transmitted diseases (stds).
barrier devices release chemicals into the body, while hormonal methods use physical obstacles.
barrier devices block sperm from reaching an egg, while hormonal methods prevent ovulation.

Explanation:

Answer:

Barrier devices block sperm from reaching an egg, while hormonal methods prevent ovulation.