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: Do particles collide more in two reactants when they are both in fluid forms or solid forms? Answer: fluid

SOLUTION: Do particles collide more in two reactants fluid they are both in fluid forms or solid forms.

PROBLEM: Question: The structure of mitochondrion plays an important role in what? Answer: aerobic respiration

SOLUTION: The structure of mitochondrion plays an important role in aerobic respiration.

PROBLEM: Question: Humans typically have how many pairs of chromosomes? Answer: 23 pairs

SOLUTION:
Humans typically have 23 pairs pairs of chromosomes.