I believe the answer is PREZYGOTIC isolating mechanisms
Chemical composition and physical properties
I know you didn't post your answer choices but I believe your correct answer would their cell walls consist mainly of cellulose.
Because cellulose definition- <span>Polysaccharide made by joining glucose subunits which makes plants and some protists sturdy.
Meaning it cannot have fungi.</span>
Both require oxygen. hope this helped! have a good day:)
