Answer:
Since 500 BC
Step-by-step explanation:
Animals have been used in medicine for thousands of years. The ancient Egyptians, Greeks, and Romans all used animals for medical purposes, including in the development of medicines and surgical techniques. For example, the ancient Greek physician Hippocrates used animal products such as honey, milk, and eggs in his treatments.
Throughout history, animals have been used in medical research to better understand the human body and develop treatments for various diseases. In the early 20th century, animal models were used to study infectious diseases such as tuberculosis and polio. In the mid-20th century, animal research played a key role in the development of vaccines for diseases such as smallpox and polio.