TASK DEFINITION: In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
PROBLEM: Question: Acting like drawstrings to close off the alimentary canal, what regulates the passage of material between compartments? Answer: sphincter

SOLUTION: Acting like drawstrings to close off the alimentary canal, the sphincter regulates the passage of material between compartments.

PROBLEM: Question: Besides the concentration of dissolve oxygen and nutrients in the water, what other factor limits aquatic organisms? Answer: availability of sunlight

SOLUTION: Besides the concentration of dissolve oxygen and nutrients in the water, the availability of sunlight limits aquatic organisms.

PROBLEM: Question: Where does growth in length occur, above the root cap? Answer: primary meristem

SOLUTION:
Primary meristem does growth in length occur, above the root cap.