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: What occurs before the endometrium thickens in estrous cycles? Answer: ovulation
Ovulation occurs before the endometrium thickens in estrous cycles.

Question: What is one problem with current methods of aluminum production? Answer: environmental contaminants
Environmental contaminants is one problem with current methods of aluminum production.

Question: A short reflex is completely what and only involves the local integration of sensory input with motor output? Answer: peripheral

A short reflex is completely peripheral and only involves the local integration of sensory input with motor output.