What is an achievement made in health care in the twenty-first century? the invention of the microscope the association between microbes and diseases the cloning of a human embryo and successful face transplants the classification of blood into groups the invention of the smallpox vaccine

The cloning of a human embryo and successful face transplants were the breakthroughs of the 21st century.

The microscope was invented in the late 16th century.

The association between microbes and diseases was established in the pre-19th century.

The classification of blood into groups was in 19th century.

The smallpox vaccine was invented in 19th century.

birth control pills, the birth control patch, and the vaginal birth control ring are these hormones prevent pregnancy mainly by stopping ovulation