instruction:
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:
Question: When gas particles collide, what kinds of collisions are these considered? Answer: elastic
answer:
When gas particles collide, these collisions are considered elastic.


question:
Question: Which of the following structures is not present in animal cells? Answer: cell wall
answer:
A cell wall is not present in animal cells.


question:
Question: What do you call a substance that cannot be broken down to other substances by chemical reactions.? Answer: an element
answer:

You call a substance that cannot be broken down to other substances by chemical reactions an element.