Since an animal only becomes more complex, and not simpler, an ancestor to all organisms would have to be the most simple and primitive organism.
        
             
        
        
        
<span>Crop
is the part of the digestive system you would see in a cross-section anterior
to the gizzard in a worm. Crop is a thin wall organ that acts as a temporary food
storage chamber. The esophagus leads to the crop and the organ next to it is
the gizzard which serves as the food grinding chamber.</span>
        
             
        
        
        
The correct answer is Oxycodone.
Oxycodone refers to a drug, which is generally prescribed in certain cases to treat severe pain. At lower doses, it leads to fatigue, memory loss, headache, itching, anxiety, and constriction of the pupil. At higher doses, Oxycodone causes lowered heart rate, slowed or stopped breathing that may eventually lead to unconsciousness and death.
In addition, it can also result in inhibition of blood flowing in specific regions of the circulatory system. This can eventually result in organ failure, loss of muscle control, and gangrene.