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: Where are some of the greatest concentrations of species found? Answer: in the tropics

SOLUTION: Some of the greatest concentrations of species are found in the tropics.

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: What is the main component of milk? Answer: water

SOLUTION:
Water is the main component of milk.