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.

Question: While spermatogenesis produces four haploid sperm cells, oogenesis produces one mature what? Answer: ovum
While spermatogenesis produces four haploid sperm cells, oogenesis produces one mature ovum.

Question: Pressure and vibration are examples of what type of stimuli? Answer: physical
Pressure and vibration are examples of physical type of stimuli.

Question: What states that chemical reactions occur when atoms, ions, or molecules collide? Answer: collision theory

Collision theory states that chemical reactions occur when atoms, ions, or molecules collide.