He association of two or more polypeptides in a multimeric protein is known as the <span>Quaternary structure.</span>
You see, passive transport needs no energy. So that being said, it moves from areas with high concentration to areas with low concentration.
Hope that helps!
Answer;
The best phrase will be;
<span>Neither benefits nor is harmed
</span>
Explanation;
Commensalism is a type of relationship where organisms of two species in which one species obtains food or other benefits from the other without harming it.
Commensal is the organism that benefits from the relationship or association.
They can also use carbohydrates so I don't know
