The answer will be an ecosytem
        
             
        
        
        
Is veins in charge of transporting the blood
        
             
        
        
        
A Muscle Contraction Is Triggered When an Action Potential Travels Along the Nerves to the Muscles. Muscle contraction begins when the nervous system generates a signal. The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron.
        
             
        
        
        
The is not a link for me to see lad.
        
             
        
        
        
The way that   partially digested food leaves the body is through the pyloric sphincter.
<h3>What is digestion?</h3>
The term digestion has to do with the breaking down of complex food substances that is taken in by animals during nutrition. Food that is  digested will go out of the body in semisolid form.
Hence, way that partially digested food leaves the body is through the pyloric sphincter.
Learn more about digestion:brainly.com/question/1283194
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