The answer is the endogenous opiate.
The human body naturally produces its own opiates like substances and uses them as neurotransmitters. These substances include endorphins, enkephalins, and dynorphin, often collectively known as endogenous opioids. Endogenous opioids modulate our reactions to painful stimuli.
The allele that is not expressed or is hidden is the recessive allele.
Answer:
Bacteria can have one flagellum or several.
Water enters the soil in a process called infiltration, and then moves downward through the soil in a process called percolation.
Sixty six is D and sixty seven is A
