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: Which side of the heart does blood from the lungs enter into? Answer: left atrium
Blood from the lungs enters into the left atrium.

Question: What can human facial expressions communicate? Answer: emotions
Human facial expressions can communicate emotions.

Question: Dentists occasionally use metallic mixtures called amalgams for what? Answer: fillings
Dentists occasionally use metallic mixtures called amalgams for fillings.