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: Why did people stop adding lead to gasoline? Answer: environmental pollution
answer:
People stopped adding lead to gasoline because of environmental pollution.


question:
Question: What do ecosystems absorb on the earth? Answer: energy
answer:
Energy do ecosystems absorb on the earth.


question:
Question: Which of the following Earth layers has the greatest density? Answer: inner core
answer:

Inner core of the following earth layers has the greatest density.