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.

Input: Consider Input: Question: Fires, mainly caused by what, are a natural disturbance in temperate grasslands? Answer: lightning

Output: Fires, mainly caused by lightning, are a natural disturbance in temperate grasslands.


Input: Consider Input: Question: What type of tissues are major barriers to the entry of pathogens into the body? Answer: mucosal

Output: Mucosal tissues are major barriers to the entry of pathogens into the body.


Input: Consider Input: Question: What is usually necessary to develop cancer? Answer: multiple genes mutations


Output: Multiple genes mutations is usually necessary to develop cancer.