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.

Example Input: Question: Most protein antigens require signals from helper t cells (th2) to proceed to make what? Answer: antibody
Example Output: Most protein antigens require signals from helper t cells (th2) to proceed to make antibody.

Example Input: Question: Expansion of a gas into a vacuum is irreversible because the external pressure is measurably less than the internal pressure of the gas, and no states of what exist? Answer: equilibrium
Example Output: Expansion of a gas into a vacuum is irreversible because the external pressure is measurably less than the internal pressure of the gas, and no states of equilibrium exist.

Example Input: Question: What is the most numerous species on the planet? Answer: bacteria
Example Output:
Bacteria are the most numerous species on the planet.