The most common substrate is soda-lime glass of 1-3 mm thickness.
It is a common substrate and food source used for feeder insects, such as mealworms and waxworms.
Nicotine and cocaine activate similar patterns of neurons, which supports the idea that common substrates among these drugs.
For freshwater aquaria, gravel is the most common substrate.
The most common substrate for this reaction is ethylene:
Several other less common substrates may also be used for metabolism, all of which lack carbon-carbon bonds.
So Kula families are united by a common substrate, the transcendent Akula.
Moreover, testosterone appears to act through the mesolimbic dopamine system, a common substrate for drugs of abuse.
This doctrine is called 'samanadhikaranya' (several things in a common substrate).
The most common substrate is glass, due to its transparency, ease of fabrication, rigidity, hardness, and ability to take a smooth finish.