Which term defines a well tested scientifically supported statement that explains how something works

Although there are a limited number of amino acids many different types of proteins exist because..

Which best describes a rhinovirus? o a. a virus that causes a common cold o b. a protective shell around a virus o c. a tube the comes off a virus o d. a piece of dna transferred by a virus

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry