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Anesthesia was introduced by surgeons in the early 1900s.

In a proportion, the numerator and denominator do not necessarily have a specific relationship.

Vitamins and their effect on the human body were discovered in the 20th century.

Which of the following words means a record of the electrical activity of the heart?

In the 20th century, the scientific approach became the principal basis for the practice of medicine.

Which of the following prefixes means after or behind?

Which of the following suffixes means pain?

Which of the following parts of a medical term gives the word its main meaning?

Which of the following word roots means stomach?

The microscope was invented in the mid 1800s.