Explanation:

- Aristotle is often referred to as the "Father of Biology." He was a pioneering figure in classical biology, making significant contributions to understanding life and the natural world. He categorized and studied animals comprehensively.

- Darwin is known for his theory of evolution by natural selection, which revolutionized biology, but he is not called the "Father of Biology."

- Heckel contributed to evolutionary theory and coined terms like "ecology," but he is not recognized as the "Father of Biology."

- Edward Jenner developed the smallpox vaccine, a landmark in immunology, but his work is more aligned with medicine and immunology rather than biology as a whole.

Option:2 - Aristotle