Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Input: Consider Input: All enzymes have an optimal temperature and ph.

Output: All enzymes have an optimal temperature and what?


Input: Consider Input: In invertebrates group of animals several forms of asexual reproduction are found.

Output: In what group of animals several forms of asexual reproduction are found?


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


Output: When does exchange of dna segments happen between non-sister chromatids of homologous chromosomes?