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.

Input: Consider Input: Question: What cellular structure is used during endocytosis to allow molecules to enter the cell? Answer: vesicles

Output: Vesicles are used during endocytosis to allow molecules to enter the cell.


Input: Consider Input: Question: What once most common bird in north america became extinct in the 1800s? Answer: the passenger piegon

Output: The passenger piegon once most common bird in north america became extinct in the 1800s.


Input: Consider Input: Question: What causes the menstrual cycle to be repeated? Answer: lack of fertilization


Output: Lack of fertilization causes the menstrual cycle to be repeated.