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: Boron only occurs naturally in compounds with what element? Answer: oxygen

SOLUTION: Boron only occurs naturally in compounds with oxygen element.

PROBLEM: Question: What is defined as the velocity of the object at a given moment? Answer: instantaneous velocity

SOLUTION: Instantaneous velocity is defined as the velocity of the object at a given moment.

PROBLEM: Question: A reptile's what doesn't generate enough energy to keep their body temperature stable? Answer: metabolism

SOLUTION:
A reptile's metabolism doesn't generate enough energy to keep their body temperature stable.