Answer:
The answer is Erasmus Darwin
Explanation:
In the 19th century, Erasmus Darwin, Charles Darwin's grandfather proposed the theory that loss of irritability in the nervous system and a decreased response to sensation or stimuli was associated with ageing.
This is one of the first theories of biological ageing; the others being Hippocrates' and Eli Metchnikoff's.
Hippocrates attributed ageing to the loss of body heat whereas, Eli Metchnikoff associated it with autointoxication. A state caused by the poisoning or intoxication of the body by toxins produced by the body itself.
