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: What can human facial expressions communicate? Answer: emotions

SOLUTION: Human facial expressions can communicate emotions.

PROBLEM: Question: What does the base of a nucleotide within dna consist of? Answer: nitrogen

SOLUTION: The base of a nucleotide within dna consists of nitrogen.

PROBLEM: Question: Which part of the atmosphere do greenhouse gasses trap heat in? Answer: troposphere

SOLUTION:
Troposphere part of the atmosphere do greenhouse gasses trap heat in.