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 property is the result of the force of gravity being opposed by the normal force? Answer: weight
Weight is the result of the force of gravity being opposed by the normal force.

Question: What type of energy is useful to humans because it's ease of transport and conversion to other forms of energy? Answer: electrical
Electrical type of energy is useful to humans because it's ease of transport and conversion to other forms of energy.

Question: What is the name for a series of changes in the reproductive system of mature females that repeats every month on average? Answer: menstrual cycle

Menstrual cycle is the name for a series of changes in the reproductive system of mature females that repeats every month on average.