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.

[EX Q]: Question: Which characteristic is shared by all cells? Answer: They need energy.
[EX A]: All cells share the characteristic that they need energy.

[EX Q]: Question: When magma reaches the surface through cracks in the earth's crust, what occurs? Answer: volcanic eruption
[EX A]: When magma reaches the surface through cracks in the earth's crust, a volcanic eruption occurs.

[EX Q]: Question: Of course, a net external force is needed to cause any acceleration, just as newton proposed in his second law of what? Answer: motion
[EX A]:
Of course, a net external force is needed to cause any acceleration, just as newton proposed in his second law of motion.