Answer:
The endocannabinoid system is believed to have been conserved in living organisms for hundreds of millions of years. It is considered to be an ancient and evolutionarily conserved signaling system. While the exact timeframe can be challenging to pinpoint, research suggests that the endocannabinoid system has been present in various forms across a wide range of species, including mammals, birds, reptiles, and even some invertebrates.
The conservation of the endocannabinoid system across such a diverse array of organisms highlights its importance in regulating various physiological processes and suggests that it likely served essential functions throughout the course of evolution.
Step-by-step explanation: