B. It is rigid it is important becuase it keeps the plants structure and it allows the plant to stand upright.It is not a fluid and because it is rigid it does not stretch.It cannot be C. because the cell wall is made of cellulose and it is a non living maerial therefore it cannot be alive
C: conducting an experiment
Voice box is what is commonly called
What are your options?
Anyways, I would say evolution
