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.

[EX Q]: Question: In what way do all vertebrates reproduce? Answer: sexually
[EX A]: All vertebrates reproduce sexually.

[EX Q]: Question: The concentration of the hydrogen ion in a solution can be calculated when what is known? Answer: ph
[EX A]: The concentration of the hydrogen ion in a solution can be calculated when the ph is known.

[EX Q]: Question: Filter feeders called rotifers collect digestive and excretory wastes in what primitive organ? Answer: cloacal bladder
[EX A]:
Filter feeders called rotifers collect digestive and excretory wastes in cloacal bladder primitive organ.