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: In humans, what is the first organ to form and become functional? Answer: heart

SOLUTION: In humans, the heart is the first organ to form and become functional.

PROBLEM: 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

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

PROBLEM: Question: One gram of proteins provides how many calories of energy? Answer: four

SOLUTION:
One gram of proteins provides four calories of energy.