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: When does exchange of dna segments happen between non-sister chromatids of homologous chromosomes? Answer: during crossing-over

Output: Exchange of dna segments happens between non-sister chromatids of homologous chromosomes during crossing-over.


Input: Consider Input: Question: The major entrance and exit for the respiratory system is which facial orifice? Answer: nose

Output: The major entrance and exit for the respiratory system is nose facial orifice.


Input: Consider Input: Question: Mollusks can be divided into how many classes? Answer: seven


Output: Mollusks can be divided into seven classes.